We did a head gasket on my car and ever since it's not idled properly. It's also over fuelling badly at idle. I changed the coolant temp sensor but it's made no difference. The car does seem to drive ok, it just won't idle? Any ideas?

It's been off the road since 2018 with this problem, but I think it's about time I try and sort it lol

 

ah paul ,your alive

try the fuel pressure regulator bud

 

I second the above. The fuel pressure regulators go bad on these cars. Mine was over fuelling and wouldn’t idle and it turned out the regulator was leaking a small amount of fuel into the air line to the intake manifold and unmetered fuel was causing it to run too rich. If you take the air line off the regulator and fuel comes out that’s your culprit.

Even if it’s not your problem change the regulator anyway if it’s never been changed as when they leak they drop petrol onto the dizzy below and I’m sure you can imagine the result!

 

Hi James! Yes I'm still alive lol. I've an aeromotive regulator on it? Have you had problems with those?

 

no paul ,i run one as well and havent had any issues

any chance you have a air-leak at the inlet gasket Paul

idle valve stuck?

map sensor?


2018 isnt that long ago,you surely must remember they are all shitboxes lol

 

Make sure the ICV valve connector hasn't been fitted to one of the injectors, same plugs on some Cossies!

 

I can't find any leaks at the inlet, beginning to suspect the Map tbh.

I remember how much I couldn't be bothered to fix it back then lol

 

It's not that - If only it was that simple lol

 

Ahh, worth a shot

 

yep their shit paul

any fuel coming out of the vac line on the fpr?

you havent got a injector stuck open ?

 

Have you got the fault code reader? It should tell you if there is an issue on any of the sensors. Alternatively check the voltage and resistance via the ecu connector. I’ll post what you need below and are my go to guides for any fault finding.

Alternatively if you’re Kent way I’m happy to help you if you’re local.


I have the led hard wired into my dash

 

That is a mega load of very useful information which should help get to the source of his problem.

 

Hi,


I have also issues with my. Idle is bad, when engine is cold. Idle goes down, up down up from 950-600-950-600....
Car has MSD 330 chip, with closed loop.
Car is starting also badly, when it´s cold. When engine is warm idle is ok and also car starts fine.

Changed parts:
-MAP
-Fuel pressure regulator
-Air temp sensor
-Coolant temp sensor
-Inlet gasket (was leaking from middle part of inlet manifold)
-Fuel pump loom
-Spark plugs

Done so far:
-Checked fuel pressure
-Cleaned ICV
-Adjusted idle (plug OFF ICV socket, turned electric devices off and adjusted idle speed to 500-600RPM and then plugged ICV socket back)


Next ideas:
-Lambda?
-Clean injectors?
-Faulty injector?

Ideas welcome....

 

I would check the voltages next to see if the sensors are working okay.

 

check the plug on your distributor and make sure your phase sensor in the distributor is in good condition

 

Idle speed when engine hot with connector removed from iscv should be 850 rpm.

Thats why it is now hunting up and down when you set it to 500-600 rpm.

 

dazcossie had a failed coolant sensor multiplug on pams 2wd saph before .... again new coolant sensor ... but failed multiplug ...

(Daz did head gasket on car from memory )

If running ok before headgasket ... gonna be something you upset during process of head gasket replacement mate ...

Btw hope your all keeping well !!