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1989 Chevy Celebrity 1989 Celebrity 2.8 sputtering and back

Tiny
STANG354
  • MEMBER
  • 1989 CHEVROLET CELEBRITY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 149,544 MILES
Hey Pros,
I have an 89 Celebrity with the 2.8 and 149 on the clock. One day the car ran perfect, the next day, it ran like garbage. At idle, it misfires and upon acceleration it has a slight backfire that I hear coming from the cat area. It also misses like crazy upon alcceleration. At idle, you can hear the misfire through the exhaust in the form of a put. Put.

Another weird thing is when I am at a cruising speed with light pedal pressure, it misfires like mad!

I changed the plugs, used 3M injector cleaner in the tank but no luck. I also checked the wires for an arc but everything looks good.

Does this sound like a bad injector?

Thanks!
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Thursday, February 19th, 2009 AT 3:04 PM

6 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Does it sound normal when cranking? Use a water bottle and start the engine , spray water gently on the exhaust manifolds to see which cylinder is cold . That will be the misifre.Then do a spark test

https://www.2carpros.com/how_to/how_to_test_an_ignition_system.htm

If ok do a compression test on the entire engine

https://www.2carpros.com/dia/how_to_check_compression.htm
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Friday, February 20th, 2009 AT 8:03 AM
Tiny
STANG354
  • MEMBER
  • 12 POSTS
Yes, the car sounds fine when cranking. This morning, the car idled perfect but once again at cruising speed and light acceleration the car was sputtering. Heavier acceleration seems to be OK believe it or not.
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Friday, February 20th, 2009 AT 8:07 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Thats sounds more like ignition than fuel. Under load ignition will fail, injectors usually will come around under load. When were the wires/plugs last replaced and what kind did you use?
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Friday, February 20th, 2009 AT 8:13 AM
Tiny
STANG354
  • MEMBER
  • 12 POSTS
Plugs were changed with AC Delco about a month ago. One of the plugs came out a bit white when compared to the others. I believe the wires were changed about 5 years ago. I think I will get a set just for good measure to see if that clears up the issue.
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Friday, February 20th, 2009 AT 8:45 AM
Tiny
STANG354
  • MEMBER
  • 12 POSTS
New plug wires fixed the issue!

When I was replacing the wires, I nicked the radiator with a screwdriver and it caused a leak. Bought a new radiator and installed it. Now the car runs really hot. If I don't have the heater on, it will go to 260 and the light will come on. With the heat on, it will run at 240, whereas before this happened it would run just under 220. The fan will keep on running as well

Could there be air trapped in the system and if so, how do I bleed it? Or is it possible that coincidentially the t-stat went bad?

Thanks!
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Tuesday, March 17th, 2009 AT 3:29 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
May want to do a t-stat just for laughs, since it has goten hot. There should be a bleeder screw on the t-stat housing or on the hard line across the front of the engine
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Tuesday, March 17th, 2009 AT 4:17 PM

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