irrattating problem

car wont boost above 4.5k when i try to go over that i get juddering like its running on 3 cylinders, also get unburnt fuel out of exhaust, anyone any ideas, car was a1 before i had boost controller taken off so dont think its any sensors etc, also no check engine light, i did have some problems 02 sensor, icvs & throttle position sensor all fixed & ecu reset no more cel

 

no one :?:

 

Im no tech bod Finley but thats what mine did when my MAF was goosed. The engine check light didnt come on either.

Worth a look if you are still running one on your car

Cheers

Gaz

 

have you checked the boost solinoid m8

 

i'll check maf & boost solenoid or hopefully whitworthf will :wink:

 

Sounds like it's going into 'get you home' mode Steve? Whilst it's typical of a maf issue other things can cause it. The unburnt fuel things sounds very much like Lambda sensor though it would be strange for the two things to pack up together. :?

If you've removed a boost controller, is the ecu still fueling for that boost level and now putting too much in? This would also soot up the plugs & Lambda....

Just a thought... :wink:

 

useful tips

something similar is happening to mine, its not juddering, but it keeps dropping boost. you can see theres a big drop on the boost gauge. ive done the engine check, with the 2 connectors under the dash, an the ecu says everything's fine. when i reset the ecu, the problem goes away. week later or so. problem returns... tis very irritating!!! :evil:

 

When my Maf was goosed I was told that a duff Maf would eventually kill the Lambda sensor too

 

If a problem returns after an ecu reset you should NOT reset again. The ecu has detected a potential problem and adjusted the settings for protection. The fault should really be fully diagnosed before a further reset. Just for info... sorry if you already knew.

 

ste check the pipe work to boost solenoid with another car. to make sure pipes are in correct place :wink:

 

already replaced lambda

 

If it only happened when you removed the boost controller then I suggest either something is not connected or plumbed correctly or something else has been disturbed.

 

replumbed boost solenoid as per jim littens description, dont make no difference, tried a 3 port same problem, when on motorway at 4k put my foot down as if to overtake, car starts missing as if running on 3 cylinders, and unburnt fuel goes out of exhaust, i let revs drop to under 4k & its happy again, also when going uphill at 4k starts again until revs drop to 3.5k.


no cel

could it be coil pack, plugs or plug leads if it could can anyone lend me any of them to eliminate problem, needs to be quick as car supposed to be getting power fc & re map this saturday

 

Without seeing the car it's difficult to diagnose, but if it was running OK before the boost conroller was removed then the problem has been triggered by its removal.

Andrew...

 

ste have you tried cam/crank sensors :idea:

 

no but wouldnt they flag ecu & record cel :?:

 

this may sound like a daft question but does your speedo work?

 

yes speedo works fine, what are you thinking :?:

 

ste he thinkin if your speedo not workin that put u into get u home mode and not let your car rev

 

Already been there guys

I suspect there is no speedo feed from the instrument cluster to the ECU and it is indeed in limp home mode.

It wasn't until yesterday that Steve mentioned that the clocks had been out to fit a speedo converter at the same time as the BC was removed.

Will have a closer look on Saturday...