Misfire

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May 24, 2002 | 09:29 AM

PL95

Thread Starter

Instructor

Joined: May 2000

Posts: 202

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From: Wickliffe Ohio

Misfire

I have noticed a missfire on my 95 Lt1. I changed the plugs and it still persists. Last night we finally had a nice night, so i took it for a ride to see if it continued on a dry day. It was worse. Also, a "SYS" code started to flash where the milage normally is. Today i found plug wire 5 has rubbed through the coating to the wire. Would this be the problem or does the "Sys" mean somthing else? Anyhelp would be appreciated. thanks in advance.

May 24, 2002 | 09:47 AM

Kizmo

Pro

Joined: Apr 2002

Posts: 605

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From: Outer Banks NC FIRST IN FLIGHT

Re: Misfire (PL95)

I just replaced my plug wires. My #5 & #7 had cuts all the way through the jacket. At night you could see the sparks fly. I had a slight miss before the replacment and now everything is running smooth.

Sorry, but I don't know anything about the sys code. Your at the right place to find out though.

See ya :seeya Kizmo

[Modified by Kizmo, 1:48 PM 5/24/2002]

May 24, 2002 | 11:23 PM

jfb

Team Owner

Joined: Mar 2001

Posts: 54,124

Likes: 30

From: Cincinnati, Oh USA

Re: Misfire (PL95)

Insulation missing on a plug wire shows that it is rubbing on something and it should not. Reduce the insulation and this will be a spot where the spark will occur and not at the plug gap causing that cylinder not to fire and the engine to shake at idle and a felt "miss" at driving speed. Dress that wire away from where it is rubbing, or better still , also replace the wire.

May 25, 2002 | 03:52 PM

bogus

Team Owner

Joined: Aug 2000

Posts: 40,156

Likes: 45

From: San Pedro CA

Re: Misfire (PL95)

how many miles??? it could be the optispark...

May 25, 2002 | 04:33 PM

Kizmo

Pro

Joined: Apr 2002

Posts: 605

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From: Outer Banks NC FIRST IN FLIGHT

Re: Misfire (bogus)

If you go to all the trouble to replace the wires (and I do mean trouble) then you might as well take a peek inside the optispark. You can tell if you need a new one, if not it's a good idea to replace the rotor.

You have a 95 so a problem with the optispark isn't as likley as with older non vented models.

[Modified by Kizmo, 8:35 PM 5/25/2002]

May 28, 2002 | 01:24 PM

PL95

Thread Starter

Instructor

Joined: May 2000

Posts: 202

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From: Wickliffe Ohio

Re: Misfire (PL95)

I replaced the wires this weekend, and it got rid of the misfire. The drivers side was a Pain in the butt. The passenger side took 15 minutes. Also, wire # 7 and 5 were worn through. I replaced them and the mis fire continued. It was wires that i thought would be fine that were the problem.

The "SYS" code still flashes (not regularly). Yesterday, i took it for a drive and when i got back in to drive home, it took 3 turns of the key to turn over. I never had that happen. It has always been on the first try. I'm concerned because of the problem starting and the "SYS" code. I guess i'll just have to get it checked on a computer.
Does anyone know how to get to the Coil wire? I can not even see it let alone change it.

May 28, 2002 | 04:12 PM

tdock

Racer

Joined: Jan 2001

Posts: 425

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From: Frederick MD

Re: Misfire (PL95)

I would get "SYS" flashing on the mileage display after I had been working on the car for a while and the battery wouldn't start the car and needed to be jumped, eventually I replaced the battery and no more SYS light, even after being disconnected and working on the car.