Hello Guys
I have a strange issue. If I accelerate hard in every gear, I get smooth acceleration all the way through to the red line. If I have to balance the throttle for whatever reason, say sitting behind a car waiting for a moment to overtake, and then I floor it, acceleration is smooth up until about 5,000 rpm and then it flat spots. I get through it eventually, but acceleration is very weak. Also, if I am driving the car normally (at about half throttle), it pulls smoothly up until about the 5k mark and hits the flat spot again. I have done various searches on the forums, and there are similar issues to mine, however they all differ in some way. Could it be a faulty MAF sensor, as this seems to be the closest match that I can get. If it is possible, is there anything I can do to test it without buying a new one first?
first thing for you to do is just pop the maf out and clean it with a little carb cleaner, that may clear the problem.. THe torque dips slightly after 5-6 anyway.
Thanks for that.
Being a bit of a rookie at this sort of thing, where is the MAF, and how do I remove it? I also don't know if it is worth mentioning, but she is using oil at quite a pace. I think it's it has drank about a quater of the dipstick in less than 500 miles.
the maf is a on the pipe vetween the air box and the engine, it has a cable connected to it. There is two screws on the top. If you do a search for MAF and CLEAN there should be some instructions somewhere.
The high oil use is a tiny bit worrying, check out the pre-cat informationt hread, and try not to worry it may be nothing.
will have a look now. cheers alex
Keep checking the oil level. You could inspect the precats in the manifold (still have them?) for peace of mind.
as the others have said, it sounds like a dirty maf.
whilst you are doing that, unplug the battery for 30 minutes. this will reset the ECU and should provide a boost in performance.
Also, as mentioned above, check and remove them nasty precats as a matter of urgency. they are a ticking time bomb and no mistake.
E
Please, please, please read up about the pre cats.
Even if they arent the problem you want to get them ripped out.
Take it from someone who knows s:evil: :evil: s:evil:
what are the pre-cats and what is their purpose? If I remove them, will it still pass MOT emissions testing, or will I have to do something to get it through?
m http://www.mr2roc.org/phpBB2/viewtopic.php?t=11393 (http://www.mr2roc.org/phpBB2/viewtopic.php?t=11393) m
See the Sticky thread(s) at the head of the topic list in this forum. MOT is not affected.
(*edit - beaten to it by the wise one. Good work, Aaron s:wink: :wink: s:wink: )
Cheers Guys - couldn't see the wood for the trees!!!!
Have checked the MAF sensor, and while it was filthy, a clean up didn't sort the issue. Next step I think will be to speak to MR-T and see what their computer fires up (if anything). Have just ordered the O2 removal socket so will check the pre-cats (nasty little things) when it arrives. I was going to replace the exhaust at some point, so it looks like it may be sooner rather than later - don't know whether or not to replace the manifold at this stage but the bottom line is those wee beasties are going one way or another!
OK - next question. I have just had the car on toyota's test rig, and they say I need 4 new coil packs and a set of spark plugs. Does this sound right? I have only just had the thing serviced (by a non-toyota dealer) who stuck a set of plugs in it. I'm told the bill will be about ... cough ... £450 all in.
So as I'm spending a bucket load on stuff that I really don't want to, are there any performance alternatives to sweeten the deal or am I stuck with the MrT standards?
I wouldn't trust anything any Toyota garage said to me
Sorry
s:o :o s:o
Pete
highly doubt it's all 4 coilpacks
do tehe plugs yourself and see if it helps
How far to Essex from Suffolk are you, you could try my MAF in it to see if it makes a difference?
Hi Liz
I'm picking it up tomorrow morning in its non-fixed state from Hills at Bishop Stortford. I also only live in Haverhill, so you're not massively far away.
Can do Sunday if you want?
There is a good ex toyota mechanic in Haverhill - John Cox - he has agreed to gut pre-cats as well at a good price.
or come to mine tommorow, since Liz and Si are here anyway, I'm only in welwyn?
I must admit, I do have my doubts on the coil packs, but then I don't suppose there is much I can do to check them other than to replace them.
I would like to try another MAF, as that is my gut feeling, but sometimes it is quite intermittent. Cheers for the offer markiii, but I think tomorrow may be out for me. I can do Sunday though if the offer is still on the table Liz. Bocking isn't far and it should be a nice day for a drive. May also get details of the Haverhill Toyota bod if you have them, as I need the pre-cats doing anyway. Not a job I fancy myself!
I should be free all day, so I can work to whenever suits you best
I must admit, I do have my doubts on the coil packs, but then I don't suppose there is much I can do to check them other than to replace them.
I would like to try another MAF, as that is my gut feeling, but sometimes it is quite intermittent. Cheers for the offer markiii, but I think tomorrow may be out for me. I can do Sunday though if the offer is still on the table Liz. Bocking isn't far and it should be a nice day for a drive. May also get details of the Haverhill Toyota bod if you have them, as I need the pre-cats doing anyway. Not a job I fancy myself!
I should be free all day, so I can work to whenever suits you best
not quite sure how I managed to post that one twice s:oops: :oops: s:oops:
£450 eeeeccccchhh how do these people sleep on a night .. I cant see it being even 1 coil pack because it would be misfiring . For £450 you could probably fill the tank, travel up here to newcastle I could fit all 4 coil packs and spark plugs(in about 7 minutes) and you could drive home with another full tank and probably fill your tank again when you got home !!!
No problem - you probably have driven past my house on the way there! Will pm you with address.
Quote from: "mr2mark"£450 eeeeccccchhh how do these people sleep on a night .. I cant see it being even 1 coil pack because it would be misfiring . For £450 you could probably fill the tank, travel up here to newcastle I could fit all 4 coil packs and spark plugs(in about 7 minutes) and you could drive home with another full tank and probably fill your tank again when you got home !!!
Yeah but youre a star Mark! s:) :) s:)
Wanna fix my crappy 106 diesel with a leaky fuel pump? s:) :) s:)
Quote from: "wparker"Cheers Guys - couldn't see the wood for the trees!!!!
Have checked the MAF sensor, and while it was filthy, a clean up didn't sort the issue. Next step I think will be to speak to MR-T and see what their computer fires up (if anything). Have just ordered the O2 removal socket so will check the pre-cats (nasty little things) when it arrives. I was going to replace the exhaust at some point, so it looks like it may be sooner rather than later - don't know whether or not to replace the manifold at this stage but the bottom line is those wee beasties are going one way or another!
Just a check, did you clean the thin wire filament bit of the MAF or the bigger dark bulb type thingy? It's just when I first did mine I did the bulb thingy which is not the right bit to clean. I cleaned the wire and it was like a different car. I think there are some pics on spyderchat.
Good point neilbro39. I cleaned the bulb which was almost black on one side. I made a bit of an attempt to clean the wires but not much. I'll revist it and let you know.
Mrwmark ... I like your style! s:lol: :lol: s:lol:
just do yourself a favour and dont touch the platinum wire inside when cleaning it, its incredibly brittle and can break just by looking at it. Only use a spray of carb cleaner at it and definatly no brushes
Hi Liz
Did you get my last PM re time tomorrow? Is that ok, or do you want to go for a different time? The clean didn't work. According to Toyota this morning, the coli pack is DEFINATELY the problem as it is arcing under load. I think I'll try the MAF first. The reason the costs would be so high is because the coil packs are £72 +vat each. Have also tried looking for non-genuine but can't find any.
See you tomorrow.
No probs, have pm'd you - forgot that I am on nights tonight - will be up by 11 and ready by 11.30! Just look for the red and yellow MR2's - you can't miss them, pull up on the drive as the road is busy!
how did it go?
I am sure Wayne will be along, but we swapped the Mafs, done the pull the fuse ECU reset and it done the trick! Last heard of Wayne was ordering one from ebay....at least it saved him £400 from the work which Mr T wanted to do and which wouldn't of fixed it!
The new MAF arrived yesterday at work, and I put it in last night. Pulled the fuse for a couple of minutes and took it for a scream up the by-pass and it never missed a beat. I haven't had the chance to do a decent length journey with it yet (prob at the weekend), it does appear to be running like a peach.
Something else that strengthens the whole MAF arguement as well - when I cleaned it and reset the ECU, it ran like a bag of bolts for about two miles. Stuck Liz's MAF in and it was v.smooth. Putting mine back in, straight away and it ran like a pig - again for a couple of miles. No such problem with the new one though, so for now I'm a happy bunny - THANX LIZ s:lol: :lol: s:lol:
Your welcome s:D :D s:D just glad that it worked....now we need to send you over to the dark side for some modding!
The bug has already started. Called in to Powerflow in Bury St Edmunds on my way home today. I need to take the car to them for a proper look, but they said that a quad pipe catback normally costs between £450 and £500. However when I told him that I can get one online for £395 he said he would match it, fit it, and I can even choose the exhaust note. I think my credit card is about to take a pounding!
OK, so the old phrase 'never count your chickens ...' springs to mind. Sadly, dreams off the exhaust are webbing away to be replaced with coil packs. I have just been out for a blat, and it has started missing, and someimtes acceleration lower down is poor. I have also noticed that it is hunting when standing at idle, going from almost stalling to about 1000rpm. The weird thing is that the majority of the time the acceleration is there, and smooth all the way through the rev range.
Anyone know where I can save myself a few quid on the equivalent of the ebay seller for the MAF sensor? It also seems to be running rich, as I smell a bit of engine fumes
Was it missing and hunting with the old MAF on - it may be worth doing a proper ECU reset - ie battery off for 30 mins, the fuse does not always clear things properly, sorry to hear this, thought we had you sorted?
And if that fails and you're still hunting for coil packs, I've got a set kicking about.
Can't vouch for them but they came off a 20k car, and you're welcome to do a "sale or return" on them. At least it gives you a chance to rule this out.
They're yours for what I paid for 'em (which wasn't much!) s:wink: :wink: s:wink: PM me if you're interested.
Thanks Spit. I'll mess around with it at the weekend, and I'll give you a shout if I need them.
I would try the injectors now mate. If you have the car put on a computer when the car is missing , it should tell you which cylinder is misfiring. You can take the injectors to diesel fitters and they can check them . I had a seized one and was doing more or less the same thing, . Luckily I was doing an engine change on another mr2 and the new engine came with some injectors so this saved me some money on new ones s:lol: :lol: s:lol:
Well, in the interest of keeping people informed, I have just got round to swapping the coil packs and the spark plugs. I got an independant garage to do it, namely my dad's garage. The genuine Toyota parts came to £320 when you factor in his trade discounts - and it is worse!!!!!
Before I go any further with this investigation, and checking the injectors I am after blood. I have a service report from Hills of Bishop Stortford advising new coil packs and plugs. I have receipts for Toyota parts, and I'm going for a refund. How successful do we think I will be???
Will keep you posted!
You haven't been on here for a while - Ste (Spit) posted that the MAFs on ebay are not as good as the Toyota ones...seen as yours ran alright with mine on, is that worth another go? Sorry to hear that you are still having problems.
And I also have a half-decent MAF kicking about (gen Denso) that works.
Yes, the EBay one is a get-what-you-pay-for generic - ours has a twin hotwire arrangement, whereas the EBay one has some sort of naff component in its place.
I had the same "woo this is excellent" followed by dreadful hunting at idle, and eventually it got so bad that I couldn't leave the throttle unattended on a cold start.
So, I bought another MAF s:oops: :oops: s:oops: even though the old one seems to be perfectly serviceable (my boost-fuelling problems must be elsewhere s:? :? s:? ).
I do need to do something. Sorry Spit, I had totally forgotten about your offer of the coil packs. The only thing I will say is I would probably have been driven down this road anyway as it wouldn't have made a difference and we didn't know the condition of the coils.
The biggest problem I have at the moment is the test with Liz's was great, but so was the ebay one for a day. I need to try one for a longer period of time to see if that is the fix.
Hi Liz
Haven't been on here for a while - busy ripping out the kitchen and putting a new one in. Seemed like a good idea at the time s:lol: :lol: s:lol:
I'm hoping to get up to JAE this year, but it will be on the Sunday. Was hoping to have new zorst by then, but this problem is sapping cash so that may have to wait. Need to try to sort the issue first before coming to Peterboro' though so might have to come up in the tin top.
Quote from: "wparker"The biggest problem I have at the moment is the test with Liz's was great, but so was the ebay one for a day. I need to try one for a longer period of time to see if that is the fix.
Doesn't surprise me that the EBay one worked well for a day - mine was the same. The biggest problem with it seems to be on cold start - for some reason it doesn't signal the ECU as it should and the car runs at AFR20+ when it should be around 11.5 (under 'choke' effect). And it doesn't fully get going properly until you're banging some heat through it. Altogether a nafmaf s:wink: :wink: s:wink:
You're welcome to 'try before buy' on the Denso and send it back if it doesn't work, or drop it off at JAE.
Spit, you are a demi-god. That would be spanking. How do you want to do this? It would need throwing in a sturdy package and posting if poss. Obviously any costs incurred regardless of whether or not it works will be sorted.
Are you able to P&P it?
You have PM s:wink: :wink: s:wink:
Cheers Spit, back atcha! s:D :D s:D
Been back to see parents today, and tried your MAF ste. Looking v promising. How much are you after?
and thanks a bucketload for posting it so quickly s:D :D s:D
Glad it arrived safe and sound
Give it a few days to bed in and see how it goes - fingers' crossed it does the trick.
I'll PM you with a price & you can either go for it or send it back. No pressure s8) 8) s8)
Hey there Spit, you have PM!
How do you insert an image into one of these threads????
Hey, what do you know - it works.
What do you reckon guys? I'm about to buy an exhaust like this for a giggle.
(http://freespace.virgin.net/w.parker/Slapa007.jpg)
buying it (hopefully) from m http://www.exhaustsuk.co.uk/onlineshop/index.php (http://www.exhaustsuk.co.uk/onlineshop/index.php) m
Sweeeeeeeeeeeeeeeeeeeeet!!! s:lol: :lol: s:lol:
Heh! Looks the danglies - go for it s8) 8) s8)
So you must be running fine now, did you manage to get Mr T to play ball on the coil packs?
Nah, not yet. I have lodged a complaint with their head office, but you may see a pic in a forthcoming Auto Express news page if I don't get a response when I call them on Monday s:wink: :wink: s:wink:
Excellent - stick it 'em. s:lol: :lol: s:lol: