Missfire and black smoke

Started by 2000mr2, March 23, 2023, 13:06

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2000mr2

Quote from: Gibla on March 29, 2023, 20:55Any news @2000mr2? , I am still following this thread with great interest.
People I bought the Maf from fucked me over I'm picking one up at lunch today and trying it

Chilli Girl

#26
Language plse Dan >:(  ;)
Ex owners of Chilli red facelift 52 reg called Chilli, silver 55 reg called Foxy and blue pfl W reg MR-S called Sapphire. Now 2 less!

2000mr2

Just fitted it , it seams to drive a lot better and sounds better but the fuel trims still show it running rich and I have eml on for running rich on both banks,

mr2garageswindon

Did you clear the codes or disconnect battery?

2000mr2

Quote from: mr2garageswindon on March 31, 2023, 15:51Did you clear the codes or disconnect battery?
Cleared all the codes

2000mr2


mr2garageswindon

Yet still getting engine light?
Was it a new maf sensor? Or known working..

2000mr2

Quote from: mr2garageswindon on March 31, 2023, 16:26Yet still getting engine light?
Was it a new maf sensor? Or known working..
Brand new from a well known part company, and it runs better but still running rich.
I had it started for 10 mins reading codes all ran fine but fuel trim was still -20 but came down to about 0.8 when warm . Then took it for a blast and the eml came on telling me bank 1 and 2 are running rich .
However it feels fine to drive now.

Ardent

Would mind popping the codes up.

2000mr2


Gaz mr-s

What brand of new maf did you fit?

2000mr2


J88TEO

Quote from: 2000mr2 on March 31, 2023, 17:25Then took it for a blast and the eml came on telling me bank 1 and 2 are running rich .
Injectors.
I had the same problem.
A know working set sorted the problem.

2000mr2

Quote from: J88TEO on April  1, 2023, 18:15Injectors.
I had the same problem.
A know working set sorted the problem.
U know any places that sell them that are cheep that are good.
I got eBay ones but they say there denso and that there oem

Carolyn

I'm thinking fuel pressure regulator.  It's a rare failure, but it does happen.

A used fuel pump assembly from J-Spec?
Perry Byrnes Memorial Award 2016, 2018.  Love this club. 
https://www.mr2roc.org/forum/index.php?topic=63866.0

2000mr2

Quote from: Carolyn on April  1, 2023, 18:49I'm thinking fuel pressure regulator.  It's a rare failure, but it does happen.

A used fuel pump assembly from J-Spec?
Is there any way to test to see if it is the pressure regulator? Or to test if it is the injectors ext.
when I replaced the injectors I replaced the o rings but not the insulators could it also be that ?

Carolyn

#41
A pressure gauge in the fuel line is the way to test it.

Injectors require specialist testing equipment. 

As you've replaced all four injectors with Densos, I think you can dismiss that one. (You'd expect at least one bank to be ok!).  I can send you a set of known good ones if you'd like to try that.

The regulator is a part of the pump assembly and it might just be easier to put another assembly in. The regulator is quite expensive to buy new.

@Beachbum 's suggestion of looking for leaks in the inlet tract is usually a good one, except that extra air above the maf reading would result in lean rather than rich conditions.

I'm struggling to think of what else will cause rich running on all four, beyond the maf and fuel pressure regulator.

All suggestions welcome!!

Perry Byrnes Memorial Award 2016, 2018.  Love this club. 
https://www.mr2roc.org/forum/index.php?topic=63866.0

2000mr2

Quote from: Carolyn on April  1, 2023, 20:01A pressure gauge in the fuel line is the way to test it.

Injectors require specialist testing equipment. 

As you've replaced all four injectors with Densos, I think you can dismiss that one. (You'd expect at least one bank to be ok!).  I can send you a set of known good ones if you'd like to try that.

The regulator is a part of the pump assembly and it might just be easier to put another assembly in. The regulator is quite expensive to buy new.


Thank you I believe I have a pressure tester about will try that how much should it be running at ?
And I can try my old injectors it wasn't running rich before I changed them it was just missfiring. But I know 2 of the old ones work so will try that too .

Carolyn

60 psi, as I recall.

Just a thought:  I had it in my head that you have a new exhaust system.  I've re-read the thread and I  can't see you mentioning the exhaust.  What exhaust manifold do you have, and have you checked it for leaks?
Perry Byrnes Memorial Award 2016, 2018.  Love this club. 
https://www.mr2roc.org/forum/index.php?topic=63866.0

2000mr2

Quote from: Carolyn on April  1, 2023, 20:5060 psi, as I recall.

Just a thought:  I had it in my head that you have a new exhaust system.  I've re-read the thread and I  can't see you mentioning the exhaust.  What exhaust manifold do you have, and have you checked it for leaks?
It's a Milan manifold and I will check for leaks but would that cause it to run rich ? Iv had the exhaust on for a few months and it's been fine ?

Carolyn

Would that be 'Malian'?

Check it.  A tissue flap taped to the end of a screwdriver will show any leaks.  It could be leaking at the gasket, or it could have developed a split.

It happens.
Perry Byrnes Memorial Award 2016, 2018.  Love this club. 
https://www.mr2roc.org/forum/index.php?topic=63866.0

Gaz mr-s

The o/e manifold & cat pipe have recesses that crush ring gaskets fit into. The Malian doesn't.  (hardly any aftermarket headers do) so what's in yours could be made-up or hybrid. The perforated gaskets that they come with are junk.

2000mr2

Quote from: Gaz mr-s on April  1, 2023, 22:03The o/e manifold & cat pipe have recesses that crush ring gaskets fit into. The Malian doesn't.  (hardly any aftermarket headers do) so what's in yours could be made-up or hybrid. The perforated gaskets that they come with are junk.
The cat one shouldn't effect it as it is past the 02 sensors will it?
but I will definitely check the manifold gasket if it's bad I'll get a steel one.
Also yes it is a Malian one.

Gaz mr-s

You might be right in your particular case, not sure.  It's common practice to re-use the o/e head face gasket, but not everyone knows.

2000mr2

Just tested the gasket with tissue tapped to a screwdriver and went all the way round, and couldn't find any leaks, will wait till it's cooled down then try soapy water around it see if I can see it bubbling though .

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