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Misfiring

Tiny
MR LUST
  • MEMBER
  • 2002 CHEVROLET TRACKER
  • 2.5L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 285,000 MILES
At idle and low speeds engine misfires spiraticly. At highway speeds it does fine
Wednesday, February 3rd, 2016 AT 12:57 PM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check for a vacuum leak and check fuel pressure with a gauge auto parts rent it scan for codes as well
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Wednesday, February 3rd, 2016 AT 1:27 PM
Tiny
THIS IS MIKE
  • MECHANIC
  • 686 POSTS
Mr lust
February 4, 2016

No vacuum leaks. Only current code is p0304. Have replaced all six coils and
plugs. Removed catalytic converter because I was getting a code that it was
clogged. Did a complete visual inspection of everything. No fuel in the
vacuum line to fuel regulator. Did a oil change and added some rislone. I put
some premium in the gas tank. It does have almost 300k miles. Runs just fine
on the highway. Have not been able to check fuel pressure yet. No service
port. Will ohm test injectors tomorrow.
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Thursday, February 4th, 2016 AT 9:42 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check compression Misfires are very hard to diagnose on the DIY level. A scanner should be used on freeze frame first then a fuel pressure check by gauge. Don't bother with injector just yet do the easier things first.
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Thursday, February 4th, 2016 AT 12:00 PM
Tiny
MR LUST
  • MEMBER
  • 4 POSTS
Compression is not good but I imagine it has been this way for awhile. 90psi on all six cyl. And leaks down immediately. Five injectors are at 10.5 ohms and one is 9.3. Have not checked fuel pressure yet as there is no service port. I am a diy'er but I do have experience. I was an ase certified tech for seven years back in the day and ive worked on cars since I was 14. Thats why im so dumbfounded. I cannot figure this one out. Taking off it will spit and spudder. Sometimes sounds like its running on three cylinders. Get above 40mph it runs like a top. No missing, has power. What am I missing.
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Sunday, February 7th, 2016 AT 3:38 PM
Tiny
MR LUST
  • MEMBER
  • 4 POSTS
And there is alot of water coming out of the exhaust. I know its water and not anti freeze. I tasted it. And its not the normal condensation its quite a bit of water.
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Sunday, February 7th, 2016 AT 3:43 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You answered your own question, low compression low resistance on one injector which I bet is #4 and a lot of water from exhaust probably a blown /leaky head gasket.
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Sunday, February 7th, 2016 AT 4:31 PM
Tiny
MR LUST
  • MEMBER
  • 4 POSTS
Then why does it run just fine at higher speeds? And the weak injector is number one not four.
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Sunday, February 7th, 2016 AT 6:38 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Because the load on the engine isn't as great. Maybe low fuel pressure as well which I asked for you to do.
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Monday, February 8th, 2016 AT 6:47 AM

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