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[mijfife]

The GLS is running fine, took it for a quick test drive tonight just to check the auto box etc. The only issue I'm having is with an uneven idle speed. It is fluctuating between 500 rpm and 900rpm ish once it is warmed up. Started from cold, the idle is steady but much higher for a spell before it drops and starts fluctuating. I switched over to lpg and the idle increases to 2000rpm but is steady. I suspect that the disconnected & broken LPG Lambda is causing this when on gas. Is the idle control valve my most likely suspect? I take it, that's the shiny cylindrical thing on the inlet manifold?   I've got a spare so will try it tomorrow anyway, just wondered if there was any other likely culprit.
Incidently, the engine management light has remained lit since I replaced the engine. As the battery was disconnected for several months, will this be a new problem or still lit from the knackered engine issues?
Many thanks, Jim

[Craig_R]

Hi There

I had the same problem with my LPG High Revs

Cleaned all the breathers, The ICV, and the Throttle housing including the butterfly Valve with lots and lots of Carb cleaner and never had the high revs again.

Hope this helps

Craig

[mijfife]

Thanks Craig,
                    I'll give everything a good clean today and see what happens

Cheers Jim

[Eliteman Steve]

Hi , Might be an idea to try the paperclip test , see what codes are stored , if a problem is solved the management light should go out , though the ecu will store the code for about thirty 'clean' starts if everything is running as it should there should be no light , this suggests there is a fault somewhere and it may be related to the uneven idle . [smiley=thumbsup.gif]

[Markie]

Dont know anything about lpg - but the revs are fluctuating quite a bit on traditional fuel arent they - clean everything, then clean it again ( carb cleaner perhaps)

Also those vacume pipes - did you ever change em - worth a shot ....

[mijfife]

Thanks for the advice so far guys. I cleaned the ICV and the throttle housing with carb cleaner this morning. On start up from cold, the car idles steady at 1000rpm. On warming up, the idle drops to an uneven 600 - 800 rpm, fluctuating as if you are blipping the throttle. I changed the ICV for a spare from the other engine but it's still the same.
Vacuum pipes all look in good condition and I'm now pretty certain that they are in the right place. Breathers are all clear too. I'm about to change the potentiometer to see if that helps. My only other thought at the moment is with the camshaft sensor. the one that came with the replacement engine had a different plug from my wiring harness so I fitted my original one. Could it be anything to do with that??  
Cheers Jim

p.s. I meant to add, my car is a facelift so I can't do the paperclip test can I?

[nixoro]

Thanks for the advice so far guys. I cleaned the ICV and the throttle housing with carb cleaner this morning. On start up from cold, the car idles steady at 1000rpm. On warming up, the idle drops to an uneven 600 - 800 rpm, fluctuating as if you are blipping the throttle. I changed the ICV for a spare from the other engine but it's still the same.
Vacuum pipes all look in good condition and I'm now pretty certain that they are in the right place. Breathers are all clear too. I'm about to change the potentiometer to see if that helps. My only other thought at the moment is with the camshaft sensor. the one that came with the replacement engine had a different plug from my wiring harness so I fitted my original one. Could it be anything to do with that??  
Cheers Jim

p.s. I meant to add, my car is a facelift so I can't do the paperclip test can I?

Did you clean the throttle body butterfly (disc) only I had this cleaned fully inc the ICV and made sure the small breather was clear and since then its been fine. Could be a sticking throttle body butterfly (disc)

Did you leave the ICV to soak for a little while as this can help wonders.

Unfortunately it a sod the facelift cant be tested using the paper clip method.

With regards the Camshaft sensor since you've fitted it is there any signs of the EML coming on. If not chances are it might be fine.

[mijfife]

Engine management light been on since I replaced the engine. I'm not sure if this is related to a new fault or still there from the previously knackered engine.

Cheers Jim

[Markie]

Decent run and how good is the battery ?

Never thought it but my very very slightly deviating revs ( i mean by about 100) seems to have gone since i took my dodgy battery out and replaced it.....

[mijfife]

Hi Markiec,
               battery seems fine, as do all the earths. potentiometer changed and still no difference. I can't take it for a good blast as it isn't mot'd or taxed yet  
               I tried increasing revs to 3000rpm for about a minute and then letting it idle again. If anything it made it worse as it was almost cutting out. I also wired in another lambda for the lpg and just had it hanging loose in the engine bay. When I switched to lpg, the idle was must steadier at just under 1000rpm so I don't think it's related to the lpg system at all. It only seems to be acting up when running on petrol. Incidently, what should the idle speed be on a 2ltr auto?
               I've heard that some engines don't run to well on petrol after using lpg, could this be the problem? The engine was from an LPG car as well.
               When I take it for the mot, does  can the emmissions be tested on the lpg setting or does it have to be on petrol?

Cheers Jim
            

[Markie]

Hmmmmm really dont have any knowledge of LPG at all - tbh not a fan.

Dont think your issues are lpg related as for is it related due to previously using , who knows.....

there`s a few lpg experts on here hopefully they should be able to solve that one.

Revs, mines sits at about 500rpm on steady idle, maybe a tad higher from memory. Not sure off the 4 pots rev on idle.....sorry not much use but i do think you have covered most of the normal reasons for the lumpy idle.

Know anyone with diagnostics locally to run a post facelift "paperclip?"

[nixoro]

Hi Markiec,
               battery seems fine, as do all the earths. potentiometer changed and still no difference. I can't take it for a good blast as it isn't mot'd or taxed yet  
               I tried increasing revs to 3000rpm for about a minute and then letting it idle again. If anything it made it worse as it was almost cutting out. I also wired in another lambda for the lpg and just had it hanging loose in the engine bay. When I switched to lpg, the idle was must steadier at just under 1000rpm so I don't think it's related to the lpg system at all. It only seems to be acting up when running on petrol. Incidently, what should the idle speed be on a 2ltr auto?
               I've heard that some engines don't run to well on petrol after using lpg, could this be the problem? The engine was from an LPG car as well.
               When I take it for the mot, does  can the emmissions be tested on the lpg setting or does it have to be on petrol?

Cheers Jim
            

Not sure if manual/auto idle rev should be the same but my 2.0 manual usually sits just under 1k revs at idle.

HTH

[Markie]

....only other thing is to let it run for a wee while - i am assuming its not runa while and the engine may have stood, maybe just needs to start circulating petrol etc etc again.

[Martin_1962]

Pipe from cam cover to inlet manifold - have you checked it is all clean including the jet into the manifold?

[Taxi_Driver]

Im pretty certain that even tho its a facelift, if its got a 2.0 then you can still do the paperclip test

Its only the FBW's you carnt.