If when you changed the leads they didn't all go back exactly as they were originally that will cause a misfire, friend had a similar issue and said the leads run inside a cover or metal tube, how much fun are this plugs to get at eh
| The Camaro Club (UK) http://classiccamaroclub.mfatw.com/ |
|
| 4th gen misfire http://classiccamaroclub.mfatw.com/viewtopic.php?f=9&t=4146 |
Page 1 of 1 |
| Author: | Pa's F-bodies [Sat Oct 25, 2014 5:33 am ] |
| Post subject: | 4th gen misfire |
OK this is a 94 V8 lt1 convertible and it has a regular misfire on one or may be 2 cylinders its hard to tell, its there at tickover and all through the range, it appears to be on number 7 or 5 as if you pull those leads off it doesn't make much difference to the running. Changed plugs and leads, also new CAT and 2 Lamda sensors. Vacuum gauge reading is High and steady so no valve train problems. still run's lump lump lump lump. and when you bring the rev's up its still the same and shakes the car at a steady miss. Now the OBD1 conector, if you put the jumper wire in A and B the fan's on the rad come on like they normally do but, With the ignition on it does not flash the check light it just stays on, there's no code 12 or any code it just stays on! But if you start the engine it does flash at the 2.5 times a second to say it running to rich, but when you inspect the plugs they look OK and dry so its only a little rich I'd say not enough to cause a misfire and the exhaust smells a little but is not throwing out any black smoke and the pipes look dark grey. Any help please, I hate this modern crap and I slowly loosing it with this one!!! |
|
| Author: | Twistedsanity [Sat Oct 25, 2014 8:14 am ] |
| Post subject: | Re: 4th gen misfire |
If when you changed the leads they didn't all go back exactly as they were originally that will cause a misfire, friend had a similar issue and said the leads run inside a cover or metal tube, how much fun are this plugs to get at eh
|
|
| Author: | jon_buss [Sat Oct 25, 2014 9:38 am ] |
| Post subject: | Re: 4th gen misfire |
Injectors? Sounds similar problems mine had (although 3rd gen, not 4th) and it turned out to be two injectors faulty. Got mine tested by a mate in the AA, think it's a a resistance test from memory. It wasn't throwing up fault codes, it was just running like crap with misfires and smelt like a petrol station from behind. Good luck! |
|
| Author: | Rocky [Thu Oct 30, 2014 11:37 pm ] |
| Post subject: | Re: 4th gen misfire |
You have to check for spark before doing anything else |
|
| Author: | Pa's F-bodies [Thu Nov 06, 2014 6:41 pm ] |
| Post subject: | Re: 4th gen misfire |
Yep leads are correct. Havn't tested injectors but I have checked that the wires to them are good and they appear to be working OK. Yep got Spark at the end of the leads and its a good one, you can pull off a lead or two and it don't seem to make much difference to the idel. I've ordered an Opti spark unit and ignition modual for it so I'll fit those first and I've found out the this 1994 model has what is known as an OBD 1.5 and you need to use a OBD 1 reader and join pin's 5 and 9 to the A and B terminals to read the codes as it will not flash any up on the check light. Why is it always me that end's up with this electrical witchcraft crap to work on!!! I hate it  Anyway thanks for the replies and I'll let you know if I BASH IT!! oop's I mean fix it. |
|
| Author: | 3rdGenmalc [Thu Nov 06, 2014 7:08 pm ] |
| Post subject: | Re: 4th gen misfire |
I ripped all that "electrical witchcraft" out.......  But what are the plugs saying, any of them oily ? |
|
| Author: | 3rdGenmalc [Thu Nov 06, 2014 8:59 pm ] |
| Post subject: | Re: 4th gen misfire |
Check this post out by, it seems, a one time poster here. http://www.classiccamaroclubuk.com/phpB ... =33&t=4167 Maybe got miffed no one replied, good point made though. |
|
| Author: | NeilTheCop [Sun Nov 09, 2014 3:41 pm ] |
| Post subject: | Re: 4th gen misfire |
It looks like you have eliminated the spark as a possible cause, Take the air filter snorkel off the throttle body and get the motor nice and warm. Now CAREFULLY spray a gently stream of carb cleaner into the throttle body. If the engine smooths out because you have added extra 'fuel' you have an injector / fuel pump / fuel filter / regulator problem. Cost so far, $0 And as for those who hate the modern electronic engine controls, take the batteries out of your TV remote control and tell me how much of an improvement it is 
|
|
| Author: | z28stu [Tue Mar 31, 2015 7:39 pm ] |
| Post subject: | Re: 4th gen misfire |
Whats the latest with this then Pa's F-bodies did you sort it 
|
|
| Author: | Pa's F-bodies [Tue May 19, 2015 6:20 pm ] |
| Post subject: | Re: 4th gen misfire |
OK in the end it was the opti spark unit 
|
|
| Page 1 of 1 | All times are UTC |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|