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Pickups Chevrolet S-10 & GMC S15 Sonoma Chevy S10 - GMC S15 and Sonoma Engine and Underhood Issues
307 messages, Last post on Aug 21, 2008 at 11:02 AM
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Replying to: dentrek (Dec 27, 2007 9:56 pm) |
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Replying to: 98shitnoma (Sep 23, 2007 7:01 am)
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Replying to: flashman3000 (Jan 13, 2008 7:41 am) Obviously your PCM is detecting misfires but cannot isolate a perticular problem. On your model it is usally a dirty or bad connection at the crank sensor, or an intermittant problem with fuel pressure. Here is an explanation. The PCM interprets irractic changes in the pulses coming from the crank sensor as misfires. Basically, your vehicle skips a beat due to any number of reasons and the PCM sees it as random misfires. Check the plug to the crank sensor and see if it is oily or dirty. I would also invest in a fuel pressure guage and verify there isn't any drops in fuel pressure. You have a engine that needs at least 55-60 psi fuel pressure at all times, or the fuel injectors will not spray fuel. GM has a poppet inside the injectors that prevent opening unless there is sufficient pressure, even though they are being told to open by the PCM. Good luck. |
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Replying to: flashman3000 (Jan 13, 2008 7:41 am)
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I have a 2002 gmc sonoma with a 2.2 with 90k miles on it whenever my truck starts the rpm is kinda jumping around and whenever I go foward it hestates to shift to second gear but after that the truck runs good any ideas? Thanks |
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Replying to: jimmy250 (Dec 29, 2007 12:02 am) The most common problem is ignition arcing because of no dialectric greese on the sparkplug boot. Bad spark plug, fualty injector for #3, engine compression problem on #3, ect. You got to do some troubleshooting and hope its one of the easy problems. If your due for a tune up, do one and see. |
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i have 99 s10 2.2ltr. eng the engine does not come up temp. and also no heat at heater in cab. i have changed thermostate 2 times and will not come up temp, runs about 130degrees. thanks for your help.
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Replying to: tomf8 (Jan 14, 2008 8:39 am) If you have a manual driven fan. I would first want to know if any modifications have been made to the engine, or the AC condensor removed or something. Has an add on transmission cooler been added? If your positive that the engine is running cold itself and not a problem with the guage and a heater control valve not letting hot coolant enter the heater core. Please post more info about your vehicle. Electric fan or manual? If electric fan, how long until it comes on after start up? Automatic or manual transmission? Modifications or add ons? How are you determining engine temp? Factory AC, or after makrket or none?
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Replying to: mickeymouse2 (Jan 13, 2008 8:52 am)
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Replying to: flashman3000 (Jan 13, 2008 8:38 am) From what I can tell from other postings is that it can be either plugged cat, bad crank sensor, poor fuel preasure, fouled EGR, vacum leak, or a new truck....i just don't know how common any of these issues are in this model to know where to really start. Guess I have to pick one and start ruling them out one by one. Any ideas? |
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