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Chevy S10 - GMC S15 and Sonoma Engine and Underhood Problems



  • i had a 205 thermostat then i put in a 180 and both of those run the same temp
  • acobboldacobbold Posts: 3
    I have a 2002 sls 4x4 extcab, buzzing noise out of the distrubutor, took off the cap it was full of white cake which had pushed its way down the dist. shaft and dried out the bearing, had the shaft removed and cleaned, changed the cap, need a tune up, I only have 48000 miles, check your 3, o2 sensors, each cost $166.00, they should flucuate between 150-950 mv, watch for stuck o2 sensor, usually around 520 mv to 950mv, change them all, ebay has all 3 for less than $150 complete, your dealer should be able to give you a diagram to show you their location, driver side hardest to change, must have small hands, locate passenger side and last one at the catalytic convert.
    i also had a 2x4 to 4x4 actuator problem, took it to a qualified tranny shop $500. later same problem, especially in the winter time, keep that 4.3 tuned up and buy an OBD CHECKER , (a good one) do not skimp here, it will pay for itself in the end, run a scan every month, egr valve is $303 dealer, ebay $83, all prices CND.

    good Luck
  • sanoma4x4sanoma4x4 Posts: 3
    I have a 2002 GMC Sanoma Crew Cab 4X4 SLS. When I am on the highway doing between 70 and 75 for about 20 minutes the check engine soon light starts to flash.
    I put on the ODB tester and it comes back 0300 for a random misfire.
    The car runs fine and has no problems at low or high speed. I have 51000 miles on a 4.3 engine. I had to replace the distributor and did a complete tune up.
    Fuel pump pressure is good. Any suggestions would be appreciated.
  • dagandwdagandw Posts: 1
    not hard... make sure you have gasket grease [(and) a gasket] and to disconnect the battery
  • sanoma4x4sanoma4x4 Posts: 3
    That almost sounds to easy of a fix, I will try it next week end.
    Thanks for the info.
  • xtremes10xtremes10 Posts: 1
    On a cold day or rainy day or just in the morning when you first start up it runs like a champ but after it gets hot ive noticed that nun of my power is there so say im in 3rd gear and i gas it, it skips sometimes cuts off on me makes like a skiping noise and smells like something is bruning and its only when its hot outside so im thinking something is getting hot and not running right ive done the wires plugs Mass airflow still the same problem sometimes if u try to give it gas it will stall and i have to pull over on the side of the road or w/e to let it cool off before i can go anymore and after that i still dont get to far i hope you can help me thanks
  • bajaracerbajaracer Posts: 1
    I have a 2001 Sonoma with the 2.2 4 cylinder engine. At low RPM (under 2500)
    I have an engine vibration to the point of shaking the dash board. At speed
    with the truck it all smooths out. The truck has 115k miles on it. My first thought
    is that the timing chain and tensioner is worn out and changing the timing
    at low RPMs.......any other ideas? Thanks
  • I have a '94 sonoma that does not have the original engine in it. Unfortunately, I got the truck after the engine switch. I don't know exactly what type the engine is, and I can't seem to see the code stamped on the rear of the block. The engine has 2 injectors that spray fuel downward into what looks like a carb, but I don't think it is a carb. Any help would be appreciated.
  • mickeymouse2mickeymouse2 Posts: 161
    GM used a 2.2L =4 cyclinder and a 4.3L =V6 on that. The Fuel Injection is called Throttle Body Injection TBI for short. Even though there has been an engine change, it is one that will bolt up to your transmission. You either have a 2.2 or a 4.3.
  • the_big_althe_big_al Posts: 1,068
    I would say going through the wheel well as hoodlatch suggested is the best way. Going through the well also works well for the spark plug behind the steering linkage. I changed all my plugs by going through the wheel wells rather than trying to lean down through the engine bay.
  • the_big_althe_big_al Posts: 1,068
    *Also Posted in Maintenance and Care*

    I had hoped that I would never have to pose this question, but here goes. I have developed an oil leak on my '01 S-10 4.3 2wd. 105K miles. Maintenance has been good - oil changes every 3K or so. Never more than 4K, and a lot of times less than 3K. But just recently I noticed oil underneath the truck. At first I thought it was a loose plug, but had it replaced at the last oil change. Filter is also tight. I pressure wshed the bottom of the engine to better able to tell where it is coming from and it appears to be coming from the rear of the motor between the motor and transmission.

    That seems to me to be the rear main seal? I don't seem to leak very much - about 1/3 of a quart in the last 1000 miles. So it's not a major problem, but I hate having oil drip becuase now I have to watch where I park for fear of leaving a nasy spot on someone's drive.

    I also switched to Mobile One on the last oil change, but I doubt that has anything to do with it. The reason I had the oil changed is I noticed oil collected on the bottom of the pan and since I was almost due anyway, took it in and made sure the plug was replaced. When I had first inspected it, that's where most of the oil was collected and so I surmised that's where my problem lay. But since changing the oil and cleaning the bottom of the engine, I still seem to be dripping.

    So now I am in quest of locating and hopefully repairing the leak with out too much hassel or expense.
  • I was wondering if anyone had a good way of testing the fan clutch on my truck. I don't think its locking up all the way. Any help would be appreciated.
  • gonogogonogo Posts: 869
    Well if it is running hot and you don't hear the roar, can't miss it, it's not working. When cold give it a spin by hand with engine off, it should not move much, should have resistance.
  • The water temp runs around 200,doesn't seem to really go down that much. Fan doesn't seem to be engaging and roaring like you said. Also moved the fan when the motor was cold, not much resistance there. Gonna have to replace it. Thanks for you help
  • Hello i have a 1998 Gmc sonoma, 4wd 4.3 liter, the clicking is kinda coming from under the front of the truck..I was reading about it and a forum said that it could be the oil.In th transfer case. Does anyone know if thats the case? and if so where is the transfer case( i think i know just making sure) and how easy is it to change? it only does it when i accelerate hard...And i dont hear it at high speeds thanks my email is

    thanks alot
  • my s10 runs smooth after doing plugs wires cap and rotor but once i get higher into rpms it backfires. kindof sounds like a pop. all the wires are good and in correct order. timming is ok. any ideas. please email me them because all this writting on one page hurts my eyes.
  • Getting ready to do a tune up on my 2000 4.3 S-10. Does anybody have any tips that will make it easier to get to the spark plugs. Doesn't seem like its easy to get to them from the top.
  • Hi,
    I have a 94 s-10 4.3 vortec 6cyl. engine. The exhaust is very very noxious. When i start the engine it actually isn't too bad. As it warms up the exhaust gets very rich as if there is alot of unburnt fuel. White smoke comes out of the exhaust .
    The truck has been sitting awhile and the gas smelt like varnish at first. The tank sensor is not working but i have gone through the bad gas and have burnt about 2 gallons of fresh fuel.

    How can i resolve this problem.
  • I have a 2002 GMC Sonoma 4X4 crew cab and get the same code (0300) when I drive at 60 on the highway. I have no hesitation at any speed and the truck runs great. Do you think the crank sensor could be the problem? I have replaced the plugs, wires, rotor. cap, distributor, fuel filter, pvc.
  • Assuming it is tuned up I would pull the EGR valve and clean the carbon deposits or simply replace also check the rubber hose connections for cracks Especialy the ones going to the egr vaccuum.
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