can you have a spun bearing with out engine knock? im wondering if that's what's causing my idle issue, i have been through the service manual, doing the diagnostics as they suggest, compression is fine, timing is fine, injectors are fine, no air leaks, coil packs are fine, getting a spark, CAS is fine, PTU is fine, loom is fine, running out of things to check, just wondering if a spun bearing would cause idle issues as it grinds it self down on the crank. i dont have engine knock. but that might not arrive until a later date with a spun bearing.

can you have a spun bearing with out engine knock? im wondering if that's what's causing my idle issue, i have been through the service manual, doing the diagnostics as they suggest, compression is fine, timing is fine, injectors are fine, no air leaks, coil packs are fine, getting a spark, CAS is fine, PTU is fine, loom is fine, running out of things to check, just wondering if a spun bearing would cause idle issues as it grinds it self down on the crank. i dont have engine knock. but that might not arrive until a later date with a spun bearing.

 

Erm...no.

 

Jeff TT

Erm...no.

 

Jeff TT

 

well that's kind of a relief i suppose, how accurate is the test to see if you have a air leak via the manual, by clamping the PCV hoses jeff? although ive striped all the pipe work down, replaced all the vac hoses arrgggh this issue is doing my head in :(

A spun bearing without knock would be impossible.Its the tolerance that holds it in place,once thats gone youll have clearance which would give the knocking sound.

A spun bearing without knock would be impossible.Its the tolerance that holds it in place,once thats gone youll have clearance which would give the knocking sound.

 

ok thanks bud. engine revs through the range fine, no knocking or anything, i do have a tapping noise that's not related to the tappets, but only when the car is in gear and driving? and only on low revs? clutch release bearing? not sure, something else to investigate, but to be honest i might just be hearing sounds that are already there and trying to relate things with my idle / hesitation issue.

Have you thought that may be your air idle valve? How bad does it idle?

Have you thought that may be your air idle valve? How bad does it idle?

 

its hard to say, its not really erratic, but it does it in stages, like its fine when the car first starts up, then as the temp comes up, it put put put put, for around 10 seconds, then its fine again, then put put put for around 10 seconds, then its fine again, hesitation feels like fuel being cut or its being held back by an elastic band for a split second, then it goes again its really doing my nut in, if you put the heating on, although its still doing it, its not doing it as bad, its like every 10 seconds or so the revs drop like the engine is trying to stall for 10 seconds, then its idling fine, then 10seconds later for 10 seconds its trying to die again.

Have you tried driving with the consult running and recording so you can see what's happening later, maybe even post the vid up for others to look at

Have you tried driving with the consult running and recording so you can see what's happening later, maybe even post the vid up for others to look at

 

Not sure how that would help, as the hesitation is only slight and once the car is going and fully warm, you dont get hesitation, its mainly on idle that its doing strange stuff, but wouldnt hurt, ill see about getting it tonight as off out soon

I recon try cleaning the air idle mate.

its hard to say, its not really erratic, but it does it in stages, like its fine when the car first starts up, then as the temp comes up, it put put put put, for around 10 seconds, then its fine again, then put put put for around 10 seconds, then its fine again, hesitation feels like fuel being cut or its being held back by an elastic band for a split second, then it goes again its really doing my nut in, if you put the heating on, although its still doing it, its not doing it as bad, its like every 10 seconds or so the revs drop like the engine is trying to stall for 10 seconds, then its idling fine, then 10seconds later for 10 seconds its trying to die again.

 

i had the same thing Ian...turned out to be the fuel pump controll box behind the rear seat on passanger side.replaced that and never came back mate.

i had the same thing Ian...turned out to be the fuel pump controll box behind the rear seat on passanger side.replaced that and never came back mate.

Was just thinking the same..pretty sure it`s already been mentioned. Bet you have a dry joint/s in the fuel ecu. It has several stages of performance and varying voltage and it`s on the same circuit as all the idle valve stuff. Also no fault codes will show confusing it even further.

anyone have a spare known good one i can use to test it before buying one?

If you`re any good with soldering they`re easy to fix..same as the speedos. Just need to have a good magnifying glass.