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Old 11-21-2010, 12:34 PM   #1
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Default Sudden idle drop and stall

I have just finished my DIY turbo build. I have a 91 1.6 running a Saab T25 turbo and BEGI rising rate FPR running at 5psi.(not fine tuned the FPR yet). When car was cold, engine idled fine during first start up. Once warmed, I turned off for approx 30 min whilst I got the timing light together to retard ignition.
When I restarted, the engine would barely keep a 500rpm idle and that was with the idle screw maxed out. I hadn't touched a thing since starting it cold and am now stumped and frustrated that the car wont hold a decent idle.
Any help would be much appreciated.
Cheers, Andy
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Old 11-21-2010, 03:17 PM   #2
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Lots of things come to mind: vacuum leak, CAS is way off, screwed up air flow meter...
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Old 11-21-2010, 06:44 PM   #3
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Thanks for your response. I dont think its the CAS or vacuum leak as I hadnt touched a thing in the engine bay. I cant see how the flow meter could get screwed up either in the space of 30 minutes?
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Old 11-21-2010, 07:05 PM   #4
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timing belt skipped a tooth?
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Old 11-21-2010, 07:50 PM   #5
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what does afr read, timing
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Old 11-22-2010, 07:07 AM   #6
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OK, I found my problem, I had a vacuum leak on the plastic cross over pipe leading to the intake manifold. I did recall inadvertantly knocking it but didnt realise it had cracked. I had a hole about 1cm in diameter. I have sealed the hole and the car now idles properly again. My issue now though is that I cant find the broken piece of plastic and think now it has been sucked into the intake manifold. I have removed the cross over pipe and it is not there so I now believe it must be lodged deep in the intake manifold .

Can someone tell me what will happen to this plastic piece if I dont strip the intake and remove it or will there be some sort of secondary filter system to stop the plastic chip from doing any damage?!
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Old 11-22-2010, 11:15 AM   #7
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There's no secondary filter. Engine would go nom nom on plastic.
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