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Chevy S10 - GMC S15 and Sonoma Engine and Underhood Issues

317 messages,  Last post on Sep 18, 2008 at 12:38 PM

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#212 of 317 missfiring by sunfiregt34 Jan 13, 2008 (4:19 pm)
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
#213 of 317 Re: engine code [jimmy250] by mickeymouse2 Jan 13, 2008 (5:48 pm)
Replying to: jimmy250 (Dec 29, 2007 12:02 am) p0303 does indicate that the PCM sees a misfire on #3.   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.
#214 of 317 99s10 running too cool by tomf8 Jan 14, 2008 (8:39 am)
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. Replies to this message: mickeymouse2 (Jan 14, 2008 7:30 pm) tomf8 (Jan 15, 2008 2:45 pm)
#215 of 317 Re: 99s10 running too cool [tomf8] by mickeymouse2 Jan 14, 2008 (7:30 pm)
Replying to: tomf8 (Jan 14, 2008 8:39 am) If you have an electric fan for the radiator, I would suspect that it is coming on to early and too long, probably a bad temp sensor for the fan, or if you have AC the radiator fan switch for that.   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? Replies to this message: tomf8 (Jan 15, 2008 2:45 pm)
#216 of 317 Re: 1999 S-10 4 cylinder surge and hasitiation [mickeymouse2] by flashman3000 Jan 14, 2008 (8:08 pm)
Replying to: mickeymouse2 (Jan 13, 2008 8:52 am) Thanks for the info. Can this problem still exist without a code coming up? I have an Auto Xray 1500 scanner and had the dealer scan it w/o any results as well. All tests on the Emmissions system comes back normal. They ruled out the injectors during the last visit. How common is the faulty fuel preasure issue with this mode? Could this be a vacum, or faulty compression issue? What should the mileage be on this type of truck....roughly? Lot's of experience with the v-8s not so much with the 4.3L. Thanks again for all of your help I'll get to checking these out this weekend just to be sure. Replies to this message: mickeymouse2 (Jan 14, 2008 10:09 pm) flashman3000 (Jan 15, 2008 12:00 pm)
#217 of 317 Re: bad gas [flashman3000] by flashman3000 Jan 14, 2008 (8:21 pm)
Replying to: flashman3000 (Jan 13, 2008 8:38 am) Not yet...changed the plugs and found one gapped at .065. Changed them out and the P0300 "random missfire" code went off. Still have the gas issue though the idle stumble seems to be gone. Still seems to be missing at normal speeds but I can't tell as the truck rides so freaking stiff in the first place. So far i've logged 135 miles on a half tank....can't be running right but it pulls hard under a load and feels strong through the gears. 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?
#218 of 317 Re: 1999 S-10 4 cylinder surge and hasitiation [toneyg] by flashman3000 Jan 14, 2008 (8:27 pm)
Replying to: toneyg (Jan 13, 2008 11:49 am) About 82K. The truck was purchased from a 68 year old woman who only drove in the texas hillcountry. Trucks in good shape except for the gas economy. I'm going to check the crank sensor and fuel preasure this weekend to rule them out. Sprayed carb cleaner all around block, intake manifold...side, back to front. No change in rpm or evidence of any leaks there. Will be using some soapy water spray on all the hoses this weekend to rule that out as well.
#219 of 317 Re: 1999 S-10 4 cylinder surge and hasitiation [flashman3000] by mickeymouse2 Jan 14, 2008 (10:09 pm)
Replying to: flashman3000 (Jan 14, 2008 8:08 pm) Can this problem still exist without a code coming up? Yes. PCM's are not all knowing. They know only what the sensors send them, and sometimes sensor info is wrong.   How common is the faulty fuel preasure issue? Rare but I have had fuel pumps briefly and intermitantly loose pressure causing random misfires. I actually had to see the failure while it happened. I even had a fuel pressure regulator fail intermitantly dropping the pressure.   Could this be a vacum, or faulty compression issue? Not a vacum issue, vacum leaks cause a lean miss and your o2 sensor would have caught that and run the engine ritch. Compression can cause misfires but I doubt that is your problem. Compression problems are rarely intermitant and are usally isolated by cyclinder and can be identified as a specific problem with one or more cyclinders.   No doubt, you got a tuffy, intermitant stuff always is. You basically have to keep trouble shooting until you find it. An intermitant coil failure or not enough output of kv spark could be it also. All the PCM knows, is that every once in a while the crank sensor is picking up a weird vibration and interpreting it as missfires. Hell, one car I finally found it, it was a loose mounting bolt for the crank sensor.   Heres a suggestion. Start with one system and eliminate it as the problem. Test it until the po300 comes back and if what ever you were testing checks out ok, move on to the next thing. Clear codes and test something else. Replies to this message: flashman3000 (Jan 15, 2008 12:00 pm)
#220 of 317 Re: 1999 S-10 4 cylinder surge and hasitiation [mickeymouse2] by flashman3000 Jan 15, 2008 (12:00 pm)
Replying to: mickeymouse2 (Jan 14, 2008 10:09 pm) You are the mandango! I'll get to checking it out this weekend and let you know how it goes. Thanks again for all your help. Most of my gear head friends either moved out of state or are dead. Yikes!!!
#221 of 317 Re: 99s10 running too cool [mickeymouse2] by tomf8 Jan 15, 2008 (2:45 pm)
Replying to: mickeymouse2 (Jan 14, 2008 7:30 pm) it does not have a/c temp on guage comes up to just above a 100 just a guess on actual temp. eater problem arose before clold eng. temp. problem. there ave been modifications or changes to truck.it has 2.2 enh. auto trans.no a/c. it takes a long time to get above 100 degrees(many miles5to10). heater is not controlled by heater control valve per-say . it has hot water a the time it is controlled by doors in heater box in cab.

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