Air leak issue?

[leeshell]

I have some more info: The mechanic thinks it's over fuelling because:

1. He can smell it
2. There is black smoke when idling and revving
3. When approaching 3000 revs it starts to backfire with black smoke and acts as though the plugs are too wet (on inspection the plugs were gapped correctly and black)

[GTO400]

Sounds like the car is running too rich check the rubber elbow that connects the vac pipe to the manifold (near the throttle body), probably has blown off which can happen. If the elbow is in postion check it's not on too far the connection pipe can block in the end of it, best to push it on fully then pull it back about 6mm.
Kevin

Edited by GTO400 on Tuesday 29th July 18:05

[saucyboy]

Adrian thanks for the update on Trevor. I'll give him a ring at the end of next week to let him get back in the swing of things.

The pipe mentioned came off mine at the weekend when I span it at Brunters. I found the car would hardly run until it was replaced.

James

[Adrian W]

chillidog said:

NobleGuy said:

Fxwhisper said:

Have you tried new plugs and gapped them up properly? I find 30thou the best on a 3r, any more and it can hesitate.

A few people have had hesitations and they almost always trace back to coil/HT/plugs.

Actually diagnosing these faults can be a right PITA ... my last one required a new wiring loom which I was damn lucky to get FOC as they're 1400 quid -

Maybe we need to discuss and agree a "how to diagnose you're misfire" on a seperate thread and then stick it on the Wiki?

Anyone want to get the thread started?
ps. I'm only the driver
--
Richard

Thanks.................i'm going on holiday

[chillidog]

Adrian W said:

Thanks.................i'm going on holiday

--
Richard

[leeshell]

Bump... It's fixed and running better then ever!!!

It was over fuelling due to being on boost apparently. One of the cables to the ECU was showing a 40 ohm resistance which led to a corroded connection. Connections have been cleaned up and is now running smooth. The map wasn't standard apparently (I was told when I bought the car it used to belong to a Noble - don't know if that's true though). They have set my idle to 850 from 700 and set the cold start to 1250 from 1400 and did something with the AC.

So it appears a faulty lambda sensor led to a backfire which blew my inlet manifold into many pieces. Then a split exhaust manifold, faulty temp sensor and a corroded ECU connection was spoiling the performance.

It seems I'm now ready for my exhaust upgrade

Then T28's next?