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S-10 & Blazer 1982-2005
The S-10 and Blazer was arguably the most versatile and accessorizable mid-size truck and SUV on the market.
Platform: S/T-series & GMT 330

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Old 12-23-2010, 08:25 PM
CF Beginner
1997 Chevrolet S-10
Join Date: Dec 2010
Posts: 3
Default 97 s10 P0301 cyl #1 misfire, no power, rough idle, bad gass mileage

I have a 1997 S10 Automatic 2wd V6 - 4.3L. I am getting a P0301 code consistently. It has 105,000 miles that is idling rough, has a loss of power at highway speeds, and terrible gas mileage (around 10mpg or less). In the past year I have changed the cmfi unit (fuel injectors/lines/poppets), the fuel pressure regulator, throttle positioning sensor, coil, fuel filter. In the past month I have changed the plugs (correctly gapped), plug wires, distributor cap, rotor, fuel filter. I have put in several fuel injector cleaners of various types including seafoam with no improvement. I am trying to figure out what to do next. The fuel pressure is 63psi with the key on while priming (key on and buzzing/whining heard) then drops to zero - while running it is 54psi. This is within specs according to the manual - aside the initial drop which causes a hard start sometimes (not an issue for now). There is a minor exhaust leak between the catalytic converter and the muffler - (seemingly a small issue unless effecting the O2 sensors). I have cleaned several sensors in the past..... I am at the point where I am trying to figure out if I should fix the truck or junk it. I am out of ideas.... I don't have the tools to check compression. I am thinking O2 sensors, or catalytic converter - or a sensor.... Any thoughts????
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Old 12-24-2010, 03:02 AM
CF Beginner
Join Date: Dec 2010
Posts: 4

try checking for vacumm leaks
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Old 12-24-2010, 02:16 PM
stock s10's Avatar
CF Junior Member
Join Date: Dec 2009
Location: CenTex
Posts: 77

How does the plug in the No. 1 cyl. look? Does it look like it is firing at all?, does it have any carbon burn on it? Does it have a fuel smell to it? It leads me to think of going back to the basic three principals of the operation of an internal combustion engine Air/Fuel, Spark and Compression. Each one has to be checked and eliminated as a problem. It could be a wiring issue causing the plug not to fire or the injector not to fire. It's just a proccess of elimination if it can be found and fixed than the truck is worth keeping.
'96 S-10 4.3L V6 K&N FIPK2 Kit, Airraid throttle body spacer, Hypertech engine tuning, Custom Cat-back Magnaflow Exhaust.

200K Miles and still pullin' like it just came out of the Showroom
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Old 12-27-2010, 12:34 AM
CF Beginner
1997 Chevrolet S-10
Join Date: Dec 2010
Posts: 3

Thank you both for your responses. I will check your suggestions again tomorrow. I appreciate your help during the busy holidays! I have not checked the plugs since I installed them a few weeks ago. I will check tomorrow and let you know. I will spend some time tomorrow troubleshooting a few last things before bowing out to the professionals with the proper diagnostic equipment. I am taking the truck to a shop on Tues. to officially troubleshoot this issue - it has been causing problems for too long. This is a test to my pride...but sometimes you must choose the path of least resistance. I will post what I learn/find out tomorrow and after the shop visit.
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Old 06-18-2011, 08:31 AM
CF Beginner
Join Date: Jun 2011
Posts: 1
Default spitting sputtering on acceleration!!

Halverson 82

Have you found the problem with the Blazer?? I am having the same issue and I have 186000 miles. I got a p301 code (#1 cylinder missfire)and a p420 code (catalyst effiency below threshold) how did you fix your issues or did you take it to the professional. I am at that stage right now. Not sure what to do>
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Old 06-19-2011, 09:51 AM
CF Beginner
1997 Chevrolet S-10
Join Date: Dec 2010
Posts: 3

So I got it running better the night before I was going to take it in the the mechanic. I cleaned all the sensors, checked for vacuum leaks, and everything else. Then I noticed that the plug wire for the #1 plug didn't go up as far as the others - by just like 1/16th of an inch or so. I got it to seat all the way like the rest of them and the problem was solved. After all the stuff I checked and cleaned - it was that the whole time. It just couldn't get a strong enough spark I guess. Hope this helps. I overlooked this several times beacuse I thought that the little bit that the boot was pushed back couldn't make a difference. Check it out - it's worth a shot. The boots on the wires seem awful thick - which makes it difficult for them to seat all the way. I used wd-40 to make them slide on all the way .... not sure if that's the right thing to use but it worked. Good luck!
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Old 06-19-2011, 09:51 AM

1995, 1997, 97, carlo, gas, idle, misfire, misfires, monte, muffler, p0301cyl1, rough, running, s10, smell, sonoma, toyota

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