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07-03-2012
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#1 |
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Join Date: Apr 2009
Location: ITALY
Posts: 261
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idle problem
Hi guys....
i have a little problem with my 1990 zr-1. When i start the engine it's run great...but after some minutes it run bad...it's seem like lose rpm and it's shake for few second, after it run ok...and after few minute it run bad for few seconds. if i push oh the accellerator pedal the engine run good. I change: Spark and fuel filter. I test the fule pressure and it's ok...50 psi on both pumps without run engine. What can i check??? Thanks to all!!!! Max |
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07-03-2012
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#2 | |
 
Join Date: Jan 2009
Location: Portland Oregon metro area (Washington side)
Posts: 3,193
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Re: idle problem
Quote:
Can you make a sound recording of it while running rough?
__________________
Scott  Vett owner since 1979._It's about the car and the people |
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07-03-2012
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#3 |
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Banned
BANNED
Join Date: Oct 2006
Location: MD
Posts: 3,674
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Re: idle problem
Max,
To help the experts (not me) diagnose your problem, give us some more info. What have you done to your car recently? Have you changed injectors? (are they original) Do you drive your Z regularly? (once a week, two weeks, month?)  David |
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07-03-2012
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#4 |
Join Date: Sep 2008
Location: Maryland
Posts: 119
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Re: idle problem
Sounds like a ignition coil going south, breaking down and coming back randomely or fuel contamination, water in the fuel will make the thing run real ugly at times, water tends to not burn very well for some reason!!!!!
New fuel filter will catch particles of crud but will still allow water to be squeezed through it and will stumble all over the place until corrected. Have you tried any fuel conditioner or fuel drier which seperates the larger water puddles and keeps the water in smaller amounts so it will pass more easily? Did the problem start to happen shortly after filling up the petrol tank recently? Good luck Gibby |
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07-04-2012
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#5 | |
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Join Date: Apr 2009
Location: ITALY
Posts: 261
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Re: idle problem
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i have original injectors (the car have 18500miles) I drive the car sometimes...also once two or three weeks.... :-) |
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07-04-2012
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#6 |
 
Join Date: Dec 2003
Location: McHenry, Il.
Posts: 6,584
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Re: idle problem
test injectors
http://www.zr1.net/forum/showthread.php?p=17299 test coils http://www.zr1.net/forum/showthread.php?p=70781 Use Solutions to help get to your problems and fix them http://www.zr1.net/forum/showthread.php?t=16778 |
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07-04-2012
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#7 |
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Join Date: Apr 2009
Location: ITALY
Posts: 261
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Re: idle problem
Hi zrwhat...
i think is an alimention problem too...i have leave the car sit down for about 45 days and after this sometimes run bad at idle...iill try to add a gasoline cleaner ;-) |
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07-04-2012
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#8 | |
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Join Date: Apr 2009
Location: ITALY
Posts: 261
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Re: idle problem
Quote:
Hi...very interesting post!!!! I'll read all when i have just a little time!!! Thanks |
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Linear Mode
