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98 S10 Misfire codes
07-06-2011, 01:53 PM
Post: #1
Rolleyes 98 S10 Misfire codes
So I have a 98 S10 pickup that is sending misfire codes for two cylinders, and running pretty poorly. It has been in the shop for the better part of the year. Here is what has been done so far: fuel injectors replaced, timing chain replaced, compression checked (fine), wires/plugs/distributor replaced, computer reflashed and a different one tested on it. Still not running. My mechanic is at a loss and is considering taking it over to a dealership to see if they can do anything with it. Any help would be appreciated...

Thanks,
A
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07-06-2011, 05:30 PM
Post: #2
RE: 98 S10 Misfire codes
Mileage, Engine, Transmission, Code Numbers?

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Garner

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07-06-2011, 06:15 PM
Post: #3
RE: 98 S10 Misfire codes
18-K plus or minus miles, vortec 4.3l, auto transmission. I know it was showing two cylinder misfires, but it is not now, just running like it is.
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07-06-2011, 06:31 PM (This post was last modified: 07-06-2011 06:33 PM by Garner.)
Post: #4
RE: 98 S10 Misfire codes
I would almost bet it is the distributor cap. If you used an aftermarket distributor and the problem was fixed for a short time, the cap is probably bad again. A GM cap will usually solve the problem. There are also vent holes in the bottom of the distributor that plug and cause condensation inside of the cap. There is usually a bulletin about this problem included with new caps. I have also encountered MANY faulty wires. You might be able to mist some water on the wires in dim light and look for arcing.

Please let us know if that helps.

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Garner

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07-06-2011, 07:02 PM
Post: #5
RE: 98 S10 Misfire codes
problem has not been fixed at all. but I will check on the distributor cap, and pass on the note about the wires arcing.
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07-06-2011, 07:34 PM
Post: #6
RE: 98 S10 Misfire codes
I’m a little confused. In one place it sounds like the engine runs but poorly & in another place it sounds like you’re saying that it doesn’t run at all. Clear that one up for me please.

If changing the distributor didn’t change ANYTHING it’s probably not the cap.

Another thing that is quite common is getting the firing order messed up. Mechanic or not, it happens! Done it myself. It’s worth a second look.

Fuel Pressure? Check it with a gauge. It only takes a couple pounds off to create problems.

Keep us posted.

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Garner

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07-07-2011, 12:01 AM
Post: #7
RE: 98 S10 Misfire codes
I agree with Garner. I have a small fleet of GM vans with the 4.3 and aftermarket dist caps, worn distributors, and fuel pressure issues have me pulling my hair out on a regular basis. Same goes for off brand ignition wires.

At one time I thought I was saving the company money with (what I thought was decent) aftermarket ignition parts. I personally gringed at the extra cost ($150 for a wire set) but I soon found out the OEM parts (Delco) were good for near 100k miles and I was convinced it was worth the extra $$$ to keep the vehicles on the road instead of in the shop. I convinced the boss when I told him it saves me a full afternoon on each vehicle and over the course of a few years that adds up to a few weeks time with a fleet.

My suggestion would be to pop for the $$$ and start with ALL DELCO ignition parts and look at fuel pressure too. I presume you meant 118K (not 18k) miles and that's prime time to think about fuel delivery issues, even though a complete fuel pump for that will be over $400 in Delco. If you don't have 55 - 60 psi it's time. Do the fuel filter too. They fill up with crap from the failing pump.

Keep us posted on your progress.
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08-04-2011, 08:52 AM
Post: #8
98 S10 Misfire codes
I seem to have a misfire, but at only above 4,000 RPM and at WOT. Below 4,000 RPM, its buttery smooth at WOT. No lower RPM driveability issues. No codes. I run Sea Foam every 10,000 miles. Plugs were replaced about 20,000 miles ago. I re gaped them about 10,000 miles ago. Plugs are Autolite AR764s. Coil packs are original. Spark plug wires are about 4-5 years old. O2 sensors have been replaced. Car has 122,xxx miles on it. MAF is cleaned every oil change. Fuel filter was replaced about 5,000 miles ago. I have not touched the air filter in about 10-15,000 miles though. What do yall think it might be?
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08-04-2011, 11:21 AM
Post: #9
RE: 98 S10 Misfire codes
Please start a new thread with your specific vehicle info and we'll be glad to help out.
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11-10-2011, 09:01 PM
Post: #10
RE: 98 S10 Misfire codes
Im having the same issue, i have a 2000 chevy blazer 4x4 4.3 vortec with 143,000 miles. I took it to a shop and had them put the computer on it and it had a weird code that said cylinder 1 misfire detected. Plugs brand new, wires distributor cap and button all about 3 months old. Havent changed fuel filter since fuel pump about 6 months or so ago. Could that be it? Any ideas would be wonderful!!
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