1997 Other Chevrolet Models Check engine light frequent

Tiny
THEBLUESGUY
  • MEMBER
  • 1997 CHEVROLET
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
Why, after replacing plugs rotor cap wires and oxegen sensor, and engine light reset, my truck, at any particular time, will kickup about 250 to 300 rpms while driving at highway speeds. This truck has always done this and no one can find the problem. The best it ever ran was 2 weeks ago after a service tech reset the timing which he claimed was off over 10 degrees? I know that don't seem possible but it is what it is. Anyway the truck was running great after he worked on it, but after 575 miles, it went right back to it's old ways.I was running 2000 rpm's cruising at 70- 72 then rpms kicked up again to 2,300 and roadspeed dropped a bit and gas milage plunged?Since then, sometimes engine light comes on. Sometimes not. Am I driving a common known chevy lemon?Distributor problems have plaqued this vehicle. Crankcase moister may be building up in cap.I replace it often. Today it might run well for a little while then change after driving 20, 30, 50, miles, who knows?This truck has spent 0ver 75% of it's life with engine light on. Always a problem to get it to pass NYS inspection rigors. Frustrated and very dissappointed in GM. Codes say missfire.
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Wednesday, December 16th, 2009 AT 4:21 AM

4 Replies

Tiny
BMRFIXIT
  • EXPERT
What do you have for codes?
Check injectors
check and do a compression test
check coil
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Wednesday, December 16th, 2009 AT 6:25 AM
Tiny
THEBLUESGUY
  • MEMBER
The code said multiple missfires.I am going to replace the dist cap and rotor this morning.I will post my results after my driving today.I bet I will find green corrosion insde the cap(after only 1100 miles) again.A condencer is what used to be in the caps of years ago. Must be GM thought global warming would dry things up!
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Friday, December 18th, 2009 AT 4:29 AM
Tiny
THEBLUESGUY
  • MEMBER
I drove the truck today just over 100 miles..started it this am and the engine light was off, but not for long..after 70 miles it was on again..this afternoon I changed the cap and rotor..the cap had some corrosin but


http://www.2carpros.com/forum/automotive_pictures/449571_rotor_1.jpg


the rotor was even worse..see picture..anyway I haven't driven it since the new changes..will post results after driving ..thanx to all who have looked into my problem..i hope together we can solve this headache..merry xmas to all.
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Friday, December 18th, 2009 AT 4:43 PM
Tiny
THEBLUESGUY
  • MEMBER
New cap and rotor were added. The truck is not performing as it should. Engine light came back on after driving less than ten miles. Power is down and gas milage is terrible. What should I replace next. Distributor? Coil? Timing chain. This truck does not backfire. But it doesn't run to it's potential. It always sends out a code for mutiple missfires.I wonder if the torque converter control valve is causing my troubles?Any suggestions?
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Friday, December 25th, 2009 AT 12:14 AM

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