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Username Post: 95 camaro misfire mystery        (Topic#337250)
Camaro3800 
Forum Newbie
Posts: 4

Reg: 07-05-16
07-05-16 09:53 PM - Post#2638033    

So I recently came across a 95 3.8 camaro with 114000 miles and no rust well maintained for $500. Great deal right? So as anyone buying a used car should I immediately bought and replaced the fuel filter, fuel, oil and filter,spark plugs and wires, and put a new open element air filter on it to tune it up and get it back in the road(car had been sitting around for sometime) but after doing the plugs and wires and I did the air filter at this time also, it wasn't running perfect before but it started to misfire and load up with no low end power. Sometimes when I'm already going 40+ and stomp the gas it will downshift and take off but other times it acts like it's under a load. Read it with my scanner and keeps showing p0300 (multiple/random cylinder misfire) I've sprayed carb cleaner around intake doesn't seem to react I've also checked all plugs and wires for bad connection and nothing there. Please help not sure what to check or if anyone's had these problems. Also not sure if related but the abs inop light came on. Also Keep in mind stock exhaust.



 




Shepherd 
Frequent Contributor
Posts: 1849

Loc: Lake George, NY
Reg: 11-11-15
07-06-16 04:28 AM - Post#2638052    
    In response to Camaro3800

If it sat for a long time one or more injectors could be sticking, common, run a couple of bottles of Seafoam or Techron thru the engine, follow the containers instructions, also make sure varmints haven't chewed any harnesses. The abs should be scanned for codes to properly diagnose the problem. Btw, welcome to CT.



 
Camaro3800 
Forum Newbie
Posts: 4

Reg: 07-05-16
07-06-16 08:40 AM - Post#2638088    
    In response to Shepherd

Thank you and I have ran sea foam through it. Last night I took a look under the hood and could see a couple shorts in the wires doesn't seem to be the only problem though. Can a loaded up cat cause such power issues? Also I know the 3.8 had heat issues with bad coils and such but that's not my cheapest route right now so I don't wanna go down that road yet



 
Shepherd 
Frequent Contributor
Posts: 1849

Loc: Lake George, NY
Reg: 11-11-15
07-06-16 06:49 PM - Post#2638210    
    In response to Camaro3800

A clogged cat would cause power losses under hard acceleration. The exhaust would make a wheezing sound if it was blocked. May want to do a full scan and check O2 sensor inputs.



Edited by Shepherd on 07-06-16 06:52 PM. Reason for edit: No reason given.

 
Camaro3800 
Forum Newbie
Posts: 4

Reg: 07-05-16
07-06-16 11:47 PM - Post#2638259    
    In response to Shepherd

Thank you how would I go about checking the O2 input? And shouldn't it throw a code for any sensor or incorrect reading in the system? It does have little to no power under hard acceleration and doesn't sound that good. Also it vibrates pretty harshly if I keep it around 2 grand and try to climb a hill doesn't even have to be steep. I also today put split corrugated tubing around plug wires and separated any touching much and thought it helped but when I looked under the hood tonight it was still sparking. I got cheap plug wires could it be that simple? Also one of the wires are ran from its tower on the coil across the other side of the coil and down and was sparking against the coil itself could this be bad sign for coil or again just faulty plug wire?



 
Shepherd 
Frequent Contributor
Posts: 1849

Loc: Lake George, NY
Reg: 11-11-15
07-07-16 04:19 AM - Post#2638274    
    In response to Camaro3800

Tough to diagnose from here, some early pcm set ups are slow to set codes, what you describe can be caused by lean mixtures, low fuel pressure, skewed o2 sensor, ign misfire, the cat, weak injectors. Fuel pressure test is in order, all the basics must be checked. If the o2 sensor was bad it would be slow to switch millivolts up and down on the scanner. Any spark leaking out of the wire means it is bad as it is looking for a ground.



Edited by Shepherd on 07-07-16 04:22 AM. Reason for edit: No reason given.

 
Camaro3800 
Forum Newbie
Posts: 4

Reg: 07-05-16
07-14-16 12:02 AM - Post#2639665    
    In response to Shepherd

Update: fixed wire issue still having misfire issues but after paying some better attention at night and as its been an increasing problem the lights and anything electric flicker like crazy! I've read on it a little but could bad alternator and or battery be causing weak voltage to coils causing misfire?



 
Shepherd 
Frequent Contributor
Posts: 1849

Loc: Lake George, NY
Reg: 11-11-15
07-14-16 12:34 PM - Post#2639737    
    In response to Camaro3800

Yes, corroded connections, poor grounds to the ign module or a bad module, or coil. The battery or alt output would have to be near 0 to cause what you describe.



Edited by Shepherd on 07-14-16 12:36 PM. Reason for edit: No reason given.

 




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