Car starts, dies under load

jonbill · September 5, 2019, 20:45

A few questions if I may:
How did you resolve the immobiliser issue?
Did you say you used the engine harness that came with the engine? Why not use the harness that your car had?
What was wrong with the old engine?
Where did the new engine come from?

Stag · September 5, 2019, 21:09

Cleaned out all of the plugs and reporgrammed a new key
It came with the engine, Id seen it running in a car so didnt see a reason to change it
conrod went through the sump
breakers

jonbill · September 5, 2019, 21:39

Fair enough, should be fine
I'd have used the loom from your car which was known to work with it and the ECU. I was wondering if perhaps the loom was from an MR-S, but that's not consist with how you resolved the immobiliser problem.

Stag · September 7, 2019, 16:05

Still not solved this problem, Anyone got any more ideas? Is it worth me swapping the looms over, take the one from my old engine that blew up and put it into the current engine? Thanks for any feedback.

Carolyn · September 7, 2019, 16:17

Swapping looms is a massive PITA.

AND no guarantee it's the answer.

When you took the plugs out and cranked it over, did you smell petrol?

Have you got a spark?

You just have to work through it systematically.

You'll get there.

Stag · September 7, 2019, 16:23

Quote from: Carolyn on September 7, 2019, 16:17Swapping looms is a massive PITA.

AND no guarantee it's the answer.

When you took the plugs out and cranked it over, did you smell petrol?

Have you got a spark?

You just have to work through it systematically.

You'll get there.

Yes, I can smell fuel, and yes it has spark. If I take the plugs out and crank the engine I get mists of petrol coming out the head.

Carolyn · September 7, 2019, 16:28

Well, you're close!!

If your MAF isn't working, it won't throw a code... got a spare maf?

are the spark plugs new?

All the symptoms of a weak spark, though....

Stag · September 7, 2019, 16:37

Quote from: Carolyn on September 7, 2019, 16:28Well, you're close!!

If your MAF isn't working, it won't throw a code... got a spare maf?

are the spark plugs new?

All the symptoms of a weak spark, though....

Brand new plugs, no spare maf sensor, anyway to trouble shoot if it is maf. Once I unplug the maf sensor it revs up to 3k but in waves, as mentioned from before but much quicker waves.
Thanks again

Carolyn · September 7, 2019, 16:38

Sounding like a MAF.

Stag · September 7, 2019, 16:43

Quote from: Carolyn on September 7, 2019, 16:38Sounding like a MAF.

Do you know of a way I can pin point it to maf before I order one, with it being Sunday tomorrow I'm not going to be able to get one till Tuesday ):

Cheers

Ardent · September 7, 2019, 16:52

Do you know anyone close that has a toyota. The maf in the 2 is used in all sorts of toyotas.
2 - prius - rx400h all the same maf.

Just a thought.

We seem to be past the need for easy start. Just for curiosity what's the condition of the air filter?

Stag · September 7, 2019, 16:53

Quote from: Ardent on September 7, 2019, 16:52Do you know anyone close that has a toyota. The maf in the 2 is used in all sorts of toyotas.
2 - prius - rx400h all the same maf.

Just a thought.

We seem to be past the need for easy start. Just for curiosity what's the condition of the air filter?

It's a next to new k&n cold air intake, don't know anyone with one ):

Carolyn · September 7, 2019, 16:55

No absolute pin-point, I'm afraid. Pity it doesn't throw a code.

Shnazzle has some expertise in this area (fuel and electronic control). (You might PM him). But as you've got sparks and fuel, it sounds like it doesn't think you've got air...

There's only three things required for an engine to run. Sparks, fuel and air.

Not easy to diagnose from a distance. And I'm fortunate to have spares to swap in....

Stag · September 7, 2019, 16:58

Quote from: Carolyn on September 7, 2019, 16:55No absolute pin-point, I'm afraid. Pity it doesn't throw a code.

Shnazzle has some expertise in this area (fuel and electronic control). (You might PM him). But as you've got sparks and fuel, it sounds like it doesn't think you've got air...

There's only three things required for an engine to run. Sparks, fuel and air.

Not easy to diagnose from a distance. And I'm fortunate to have spares to swap in....

Any chance I can transfer you some money for a maf sensor next day shipping ?

Carolyn · September 7, 2019, 17:00

Sorry, that would be my diagnostic tool gone.

Someone else might have, though.

jonbill · September 7, 2019, 17:17

Did the MAF come from the new or old engine?
Surely if old, its known good?

Stag · September 7, 2019, 17:20

It was the one that was in my engine originally, had 0 problems with it before. Can't see why it would just stop working

Carolyn · September 7, 2019, 17:21

Quote from: jonbill on September 7, 2019, 17:17Did the MAF come from the new or old engine?
Surely if old, its known good?

Parts do fail....

Carolyn · September 7, 2019, 17:22

It could also be the maf wiring/connector....(harness....)

Shnazzle will post later. He's thinking MAF too.

Stag · September 7, 2019, 17:47

Cheers for the feedback guys, will do some trouble shooting tomorrow

shnazzle · September 7, 2019, 18:00

The air intake... What is it?
Did you have it on the previous engine?

I may have a maf you can try. It's rare but they can go.

Just for trials sake, can you please try running it without the maf plugged in? So let it run for a bit, turn off, unplug, start her up and hit the throttle a bit and report back

Carolyn · September 7, 2019, 18:05

Quote from: shnazzle on September 7, 2019, 18:00The air intake... What is it?
Did you have it on the previous engine?

I may have a maf you can try. It's rare but they can go.

Just for trials sake, can you please try running it without the maf plugged in? So let it run for a bit, turn off, unplug, start her up and hit the throttle a bit and report back

"Brand new plugs, no spare maf sensor, anyway to trouble shoot if it is maf. Once I unplug the maf sensor it revs up to 3k but in waves, as mentioned from before but much quicker waves."

shnazzle · September 7, 2019, 18:40

Quote from: Carolyn on September 7, 2019, 18:05
Quote from: shnazzle on September 7, 2019, 18:00The air intake... What is it?
Did you have it on the previous engine?

I may have a maf you can try. It's rare but they can go.

Just for trials sake, can you please try running it without the maf plugged in? So let it run for a bit, turn off, unplug, start her up and hit the throttle a bit and report back
"Brand new plugs, no spare maf sensor, anyway to trouble shoot if it is maf. Once I unplug the maf sensor it revs up to 3k but in waves, as mentioned from before but much quicker waves."

Ah sorry. Missed that part. I'll put down the phone until after I'm back home

Stag · September 7, 2019, 19:17

I'm at work till 2am tonight so won't be able to test anything till tomorrow unfortunately,

The air intake is this https://www.eurocarparts.com/search/508820731?type=shopping&gclid=Cj0KCQjwqs3rBRCdARIsADe1pfRKPxOMQlUubKTkgmVqy_X1vfnC-TbGasfC9y0Sy6SKa4g7PcbeyrIaAph3EALw_wcB

Had it in the car before and worked fine.

Cheers

shnazzle · September 7, 2019, 21:40

Bit weird without any metrics at all, leaving you with trial/error.

When it idles, it idles OK. No bumbling or obvious misfiring.
So we've got fuel and spark.

At first start and idle it has no o2 feedback at all, so it's running "dumb" off the ecu.

The car has mechanisms to protect against MAF failure; engine vacuum measurement. Its last hope for knowing how much fuel to put in. As fuel goes in and timing changes, revs rise, which changes vacuum.
That's why my thought goes to MAF.

Unplugging maf does little. Tell tale sign for any sensor. If you remove it and there's no or little change, it's probably duff.

Big unknown is the harness. It could have been nicked during removal etc.

Do you have an OBD2 dongle and android phone? Or iPhone and WiFi obd2 dongle?