2002 Chevy Camaro engine hesitation/misfire at low RPM whil

Tiny
02REDCAMARO
  • MEMBER
  • 2002 CHEVROLET CAMARO
  • 6 CYL
  • 2WD
  • MANUAL
  • 81,000 MILES
Have replaced the following:
Fuel filter, air filter, MAF sensor, spark plugs and wires,
cleaned injectors, replaced cat conv (junk), hesitates only when fully warmed up in any gear when rpms are at about 1500. Coils test good. Codes showed misfire in cyl 1 and 5. Fuel pump repl 15K miles ago.
Hasn't given me any trouble until now (except for fuel pump. Have owned for 5 years/50K miles. Oil and coolant good. Cond made worse when air cond on and have passengers (high load/low rpms). No symptoms when engine cold. Bad injector? Bad ignition module? O2 sensors?
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Friday, June 4th, 2010 AT 12:46 AM

7 Replies

Tiny
RASMATAZ
  • MEMBER
Hi 02redcamaro, Welcome to 2carpros and TY for the donation.

If the clutch is not slipping -Check the sparkplug, compression and injector for no.1 and 5 and also test the throttle positon and manifold absolute pressure sensors to include the EGR valve.
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Friday, June 4th, 2010 AT 2:44 AM
Tiny
02REDCAMARO
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Thanks for the reply. Clutch not slipping, spark plugs and wires new (and good), wondering if driving it with plugged cat converter caused any damage to something else. Ideas?
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Tuesday, June 8th, 2010 AT 5:15 PM
Tiny
RASMATAZ
  • MEMBER
A clogged catalytic converter will cause the engine not to start, lose power and cause overheating-the engine is not breathing right-
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Tuesday, June 8th, 2010 AT 5:19 PM
Tiny
02REDCAMARO
  • MEMBER
Rasmataz -- I believe that I have solved the problem.
Replaced ignition coils -- SHAZAM! Misfire went away,
at least for now. What I believe happened is that when cat conv went bad, exhaust backed up, making the engine run hotter, coils are on top of drivers side valve cover and EXHAUST MANIFOLD,
coils degraded, couldn't work once heated up, unless they just went bad, hard to believe after only
80K miles though. If it still runs good after a week, I'd say I found the problem. Too bad trouble codes don't identify coils.
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Sunday, June 20th, 2010 AT 3:05 PM
Tiny
02REDCAMARO
  • MEMBER
Rasmataz -- I believe that I have solved the problem.
Replaced ignition coils -- SHAZAM! Misfire went away,
at least for now. What I believe happened is that when cat conv went bad, exhaust backed up, making the engine run hotter, coils are on top of drivers side valve cover and EXHAUST MANIFOLD,
coils degraded, couldn't work once heated up, unless they just went bad, hard to believe after only
80K miles though. If it still runs good after a week, I'd say I found the problem. Too bad trouble codes don't identify coils.[/Quote:1e490cb94a] Suspect when engine is fully warmed up and engine at 1500 rpm, when the ignition advances spark (timing), the coils couldn't handle the signal. :))
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Sunday, June 20th, 2010 AT 3:09 PM
Tiny
02REDCAMARO
  • MEMBER
Rasmataz -- I believe that I have solved the problem.
Replaced ignition coils -- SHAZAM! Misfire went away,
at least for now. What I believe happened is that when cat conv went bad, exhaust backed up, making the engine run hotter, coils are on top of drivers side valve cover and EXHAUST MANIFOLD,
coils degraded, couldn't work once heated up, unless they just went bad, hard to believe after only
80K miles though. If it still runs good after a week, I'd say I found the problem. Too bad trouble codes don't identify coils.[/Quote:fb7a7a1437] Suspect when engine is fully warmed up and engine at 1500 rpm, when the ignition advances spark (timing), the coils couldn't handle the signal. :))[/Quote:fb7a7a1437] One last note -- coils "tested" good with ohm meter, but they were still apparently bad.
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Sunday, June 20th, 2010 AT 3:12 PM
Tiny
RASMATAZ
  • MEMBER
Im happy for you getting back on the road-so much of manufacturing stuffs huh! Good Luck
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Sunday, June 20th, 2010 AT 4:03 PM

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