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3.8 misfire
http://classiccamaroclub.mfatw.com/viewtopic.php?f=6&t=4561		 Page 1 of 3
Author:  BillyBob 780 [Thu Jul 02, 2015 10:11 pm ]
Post subject:  3.8 misfire
Parts arrived for my mot. Trotted off in the car to the garage to have the caliper fitted and re mot. Car has started to misfire quite badly if the engine is put under load ie pulling away at speed and hard acceleration or attempting to go over 40-50 mph. My mate changed the plugs and leads( thanks to the designer for the placement of those). Anyway still the same and at one heady point attempting 70mph on the A46 misfired so bad the engine managment light started to flicker on and off until I backed off the throttle! Any ideas?[
Author:  78 Camaro [Fri Jul 03, 2015 11:37 am ]
Post subject:  Re: 3.8 misfire
Bugger that's not sounding good :/

My initial thought... battery? When my alternator went and the battery was already weak, the car started bogging down and barely made it home. A few people on here were giving me advise when i was diagnosing it and it was mentioned that Injection systems rely heavily on voltage (they said it much better).

Other than that, only other thing i can think of is maybe the throttle body? Maybe worth giving it a clean with some carb cleaner or something, making sure the mechanism moves smoothly etc.

Final though, maybe to do with the fuel delivery... blocked fuel filter / bad pump?
Author:  BillyBob 780 [Fri Jul 03, 2015 12:34 pm ]
Post subject:  Re: 3.8 misfire
Yep Im thinking slightly blocked injector Ive got some "trade" injector cleaner and Ill be popping the throttle body off for a good clean and check the vac pipes. Ive discounted voltage as the gauge is showing a good 13.5 volts or so.
Author:  bnc47 [Fri Jul 03, 2015 4:59 pm ]
Post subject:  Re: 3.8 misfire
Quote:
Yep Im thinking slightly blocked injector Ive got some "trade" injector cleaner and Ill be popping the throttle body off for a good clean and check the vac pipes. Ive discounted voltage as the gauge is showing a good 13.5 volts or so.
It wouldn't hurt to follow 78's advice and get the battery tested anyhow.
Voltmeters do not always tell you the whole story, and it shouldn't cost anything.
Hope you find the problem.
Author:  a2kmaro [Fri Jul 03, 2015 8:00 pm ]
Post subject:  Re: 3.8 misfire
Don't forget the common coil issues - usually the middle one of the three ;)

I had exactly the same issue with my 2000 3.8 but once we changed that coil it was poifect ;)
Author:  BillyBob 780 [Fri Jul 03, 2015 8:34 pm ]
Post subject:  Re: 3.8 misfire
Is there a method (easy one) for testing ?
Author:  a2kmaro [Sat Jul 04, 2015 7:24 am ]
Post subject:  Re: 3.8 misfire
Quote:
Is there a method (easy one) for testing ?
We just bought one because there was nothing left it could be as we replaced just about everything else and just tried one by one. It's usually the middle of the three because the location ;)
Author:  NeilTheCop [Sat Jul 04, 2015 6:41 pm ]
Post subject:  Re: 3.8 misfire
Quote:
Parts arrived for my mot. Trotted off in the car to the garage to have the caliper fitted and re mot. Car has started to misfire quite badly if the engine is put under load ie pulling away at speed and hard acceleration or attempting to go over 40-50 mph. My mate changed the plugs and leads( thanks to the designer for the placement of those). Anyway still the same and at one heady point attempting 70mph on the A46 misfired so bad the engine managment light started to flicker on and off until I backed off the throttle! Any ideas?[
The flickering light means the codes showing the problem have already been stored. Get it scanned and go from there.
Author:  BillyBob 780 [Sat Jul 04, 2015 8:20 pm ]
Post subject:  Re: 3.8 misfire
Any body in Coventry with a scanner?
Author:  Twistedsanity [Sat Jul 04, 2015 9:01 pm ]
Post subject:  Re: 3.8 misfire
i have one but im in watford, you can get them cheap enough off of the bay now
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