2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

strong bouncing idle after hard pull ping rich

Old Jun 9, 2010 | 01:07 PM
  #26  
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Originally Posted by lastphaseofthis
never had a bouncing idle caused by anything but a TPS( 10% of the time), or a vacuum leak(90% of the time). sounds like boost blew a line or a nipple off.
do you have paper or metal intake gaskets?( or maybe just silicon?)
Paper or silicon, i would check there also. or do a intake pressure test, as these dont seem to expensive to get the parts to do. just some homedepot fittings, guage, and some soap and water.
Just curious, (and pardon the hijack but it may help others as it seems the OP does not have any vacuum leaks) where is the most common vacuum leak on these things?
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Old Jun 9, 2010 | 06:02 PM
  #27  
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Originally Posted by soundquest
Just curious, (and pardon the hijack but it may help others as it seems the OP does not have any vacuum leaks) where is the most common vacuum leak on these things?
There is no such thing as "common vacuum leaks". If there is, it would be were you commonly forget to hook up lines...
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Old Jun 10, 2010 | 10:28 AM
  #28  
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A pulsing idle is typically a vacuum leak, a few things to check:

Throttle cable for seizing, needs to returning completely
Turbo inlet duct for cracks
All couplers and clamps on intercooler
BOV for leaks, especially if it is aftermarket

Check your boost sensor, if the voltage is screwy it can tell the ECU all kinds of bad info
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Old Jun 10, 2010 | 11:18 AM
  #29  
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bouncing idle can be vacuum leak. one reason its more likely a vacuum leak instead of a tps: it started after you did a hard pull.

im going to guess that boost pressure blew off a vacuum line.
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