ChrisTAWS6

This is my first post here, so hello everyone. I am trying to get as many opinions as possible on my misfire problem, and I was told that this site was a great place to start. Here's the deal:

I have a misfire on cylinder 4. It was present (on the same cylinder) before I changed my plugs and my wires. Since then misfire was still there, I opted to change coil pack #4 with coil pack #1 (#1 had zero misfires). AutoTapped it again, and the misfire was still in cylinder 4, and the same amount as well. Cylinders 2 and 3 are also misfiring, which just so happen to be on the same side as #4.

I can only think of 3 things that could be wrong now:
1) The wiring leading to the coil packs is screwed somehow.
2) The ground for the wiring to the coil packs is bad.
3) MAYBE my valves for cylinder 4 are screwed (my heads have been removed once for a cam install).

The cam is LS1 Hotcam, other mods are Yank SS 3600, Hooker LT headers and ORP, gears, lid, bellow, and FTRA. I'm pretty lost, and can't afford to have the dealer tear **** apart to find out the problem just yet.

Anyone had similar problems, had a friend like this, or heard of anything similar? I'm just looking for ANY opinion whatsoever. Thanks for the time.

LSwonZ28

well, I know the hotcam will always throw misfire codes. I know mine does. You can't do anything about it until you get rid of the code with ls1edit or have the person tuning your car get rid of it. I hope I helped a little <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />

<small>[ April 15, 2003, 07:33 PM: Message edited by: LSwonZ28 ]</small>

Camaroholic

iTrader: (1)

Is the car using coolant?

A very small head gasket leak could show up as a misfire. I work with a guy who had a coolant leak from the intake manifold on his truck (Vortec motor), and the only indication was a consistent misfire on one cylinder. It was leaking in to the intake port.

Another possibility is a faulty fuel injector. Try moving injectors around.

Maybe that helps.

Andrew

ChrisTAWS6

They told me that they wouldn't tune the car with a misfire like that. It's not just a simple little misfire. In an approximate 8-10 second cycle, I'm getting 150-200 misfires @ 1000 rpm (my idle speed). I think if they could have gotten rid of the misfires with tuning, they would have done it for me. <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> Who knows?

ChrisTAWS6

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Camaroholic:
<strong> Is the car using coolant?

A very small head gasket leak could show up as a misfire. I work with a guy who had a coolant leak from the intake manifold on his truck (Vortec motor), and the only indication was a consistent misfire on one cylinder. It was leaking in to the intake port.

Another possibility is a faulty fuel injector. Try moving injectors around.

Maybe that helps.

Andrew </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">How do I check for a head gasket leak? Any simple, low-cost way to check this?

99taws6

iTrader: (2)

Sounds to me like a bad spring.. Mine did this when I broke an exhaust spring...

Mine would misfire bad until about 3k and then it would go away... Turned out the spring broke in half (Comp 941)

ChrisTAWS6

Can I check the pushrod and spring by just taking off the valve cover? I've never had to check these things, so don't flame me for being ignorant. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Reckless

iTrader: (9)

First....#2, #3, and #4 are not on the same side. Driver's side is 1-3-5-7 and pass side is 2-4-6-8 (from the front of the engine).

I had a similar experience recently. Numerous misfires on #5 and #6. After much grief, it turned out to be an internally broken wire on the #5 injector. Since #6 fires right after #5, the misfires were "echoing" in that cylinder.

Use an ohmeter to check for continuity on the injector wiring between the injector plug and the computer connection. You could also use an injector "noid" to do the same thing.

01redws6ta

The noid light idea is a good one and the simplest to check first. I've had a 2001 Camaro SS in the shop a while back with only a couple hundred miles that had a single cylinder missfire. Upon further inspection- no noid light action on that injector, power OK. PCM wasn't providing the pulse ground signal to that one injector. Replaced PCM, programmed to car, and performed crankshaft position variation learn. It was happy again then.

99taws6

iTrader: (2)

To check Pushrods:

1. Pull Coil Pack Bracket off.
2. Pull Rocker Arm Cover off (Valve Cover)
3. Loosen and remove rocker arms
4. Twist, wiggle and pull springs to check them
5. Remove pushrods and roll on sheet of glass....