1989 Mazda 929

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  #1  
Old 05-04-04, 08:16 AM
DRLM001
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Question 1989 Mazda 929

Hi there.I have a problem with the idle.The car is a 18 valve v6 with apx.280k on it.The problem is when you start it when it is cold or sat for any length of time it "surges" untill it warms up.up and down up and down it could drive you nutts!!!lol Any suggestions would be appriciated.
 
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Old 05-09-04, 12:13 AM
poppalizerd
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check your compression with a tester by the compression specs see if there off with a tester
could be intake manifold air leak that seals its self when its hot then it runs better
emissions to faulty fuel pump getting ready too go
sounds like a faulty fuel pump or leak not really by warming up but by running a while it has happend

you just might want to have a tune up
or someone may give you better advice
could be a stupid little thing

i bet a major tune up would help your prob
 
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Old 05-09-04, 03:07 AM
Desi501's Avatar
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Originally Posted by poppalizerd
could be intake manifold air leak that seals its self when its hot then it runs better
Vacuum leaks don't seal themselves

Originally Posted by poppalizerd
emissions to faulty fuel pump getting ready too go
sounds like a faulty fuel pump or leak not really by warming up but by running a while it has happend
No it hasn't


Originally Posted by poppalizerd
i bet a major tune up would help your prob
I bet it doesn't

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A vacuum leak somewhere is the likely culprit. It could be internal in a decel valve if it has one. The decel valve could be faulty and cause that. Check it real good for external leaks first. Clean the throttle body and throttle plate if you haven't already done that.
 
  #4  
Old 05-09-04, 11:14 PM
poppalizerd
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a leaking gasket i was talking about leak sealing up by heat desi ive seen them seal up after temp heats up not threw a vac line lol threw gaskets you said same thing i said basically
maybe i should of typed it out more clearly my bad
just giving a opinion i know some stuff mostly performance
not mechanics
 
  #5  
Old 05-10-04, 02:32 AM
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Originally Posted by poppalizerd
a leaking gasket i was talking about leak sealing up by heat
No, a gasket will not seal up by heat. It merely has less effect on a warm engine than a cold engine.
 
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