My zed has developed an idle problem when stationary. The vehicle always starts but sometimes idles ok and at others the idle dies away but rarely stalls.

 

If the accelerator is depressed/feathered then it appears to bog down and tries to stall unless its then left to idle again. When idle dies it can restart immediately and continue driving.

 

The car drives fine once going (under load).

 

In the last 3mths its had a new knock sensor, new alternator, timing belt, cam belt, power steering belt, air con belt, new plenum gasket, all injector seals replaced, clutch pedal repair & improvement, new spark plugs, Thermostat, new IACV air regulator, heater matrix, replaced fuel pressure regulator, fuel dampener, coils replaced.

 

Am i right in thinking that the most likely causes for this issue are mass air flow or throttle position sensor????

 

Any other things to look for or check??

 

Any help greatly appreciated :)

OK,

what I would do is check all connectors again particularly the CAS & PTU,

check the connector to the ECU... disconnect the battery first if you are going to take it off and reposition it.

 

also you say that the timing belt was done, what was the timing set to? if you want to check you have to use a timing light.

it should be set to 15 degrees (I believe for a TT, not sure about an NA) but you could adjust it to see if it improves.

 

Thanks. All one my list to do. Not even had a chance to look at it since the first post :(

 

Too many other projects on the go BUT i'll get around to it and no doubt be asking for more help :thumbup:

just fyi...

 

i had a similar issue with hesitation under load and when cold.

i changed almost everything (small fortune) and it turned out to be the timing was wrong..

oh well lesson learnt, didn't bother checking because I couldn't believe that it would be wrong!!

anyway... good luck. :)

i know this might seem obvious but go back and check that all the coil pack & injectors connectors are on the right plugs....

I've seen a post recently where this was a problem...

Im just wondering if you have a vac leak, it will affect the idle and overall running so adjusting the idle probably wont help as it cant compensate for the air escaping.

If you want to drop it to me one day, i can run you to work and have a good look over it for you. I know how frustrating it can be when its not running right.

 

Cheers

Graham

 

Brilliant offer thanks Graham. I've actually got Thursday and Friday off this week so could drop it to you and walk back home as it's my missus' birthday.

Brilliant offer thanks Graham. I've actually got Thursday and Friday off this week so could drop it to you and walk back home as it's my missus' birthday.

 

Thursday is good for me, i will give you a lift back, its a fair walk lol.

 

Say 11am at Salisbury road?

 

Cheers

Graham

Excellent cheers matey I'll see ya there at 11.00.

Many thanks :)

Update......................................

 

Many thanks to Graham for diagnosing the fault with my Z.

 

Would appear the MAF sensor had gone faulty but not sufficiently to show on ECU check or Datascan.

 

However after trying things out the sensor failed and the motor went to safe mode.

 

New MAF ordered and now fitted. Problem has gone away. Needs a tweak or two for 100% running but at least it has solved the issue.

 

Very pleased.

 

Thanks again Graham :)

Glad your loving your zed again Trevor, if you want me to run the diagnostic again and tweak it, then let me know.

Dont forget to get your gear lever bushes ordered, only a few quid, but will make the gearstick feel like it should.

Glad your loving your zed again Trevor, if you want me to run the diagnostic again and tweak it, then let me know.

Dont forget to get your gear lever bushes ordered, only a few quid, but will make the gearstick feel like it should.

 

Yes she could use a tweak I reckon so if you do have a moment to spare maybe next week one evening maybe?

 

Yes, I'll be ordering them there bushes too.....

 

Your help is much appreciated :thumbup1:

Yep anytime is good for me, just let me know which day etc you want to do it.

 

No worries :thumbup:

Cheers matey will do