Question about 1992 Chevrolet K1500
Thank you for getting back to me so promptly. greatly appreciated. here is the problem- the check engine light has come on twice and turned off by itself. the truck is starting to behave as though ( it has bad gas or fuel filter is clogged or o2 sensor is not functon correctly) in traffic at a light she wanted to stall out on me - to keep it going i power braked ( this is the first time I've had to do this with this truck) any suggestions thank you theresa
What makes an 84 dodge truck shut off after running for 15 minutes
Posted on Nov 28, 2008
Thank you for the information. your very well informed. However since the last time I spoke to you the truck has been running fine up until last week. I still think it is an oxygen/fuel sensor of some kind. This would also cause poor performance in this truck such as bad fuel consumption, lack of power.The trucks service engine light came on today first thing this morning and the truck was running funny. - shut the truck off once I got to my project site - turned it back on later and no more idot light and the truck was running okay as well. Checked the check engine code it flashed 12 twice than flashed 42 any idea what code 42 is? As far as the oil leak, the oil pan gasket needs replacing. Please help. Thank you. Theresa
Posted on Sep 18, 2008
The problem I see is that your engine is consuming oil and not maintaining pressure. It sounds like the engine is losing compression, possibly through a head gasket problem. Check the coolant - do you see any oil in there? Also, after you drive it for awhile and return home, park it with clean cardboard under the engine on the ground, so that if it's leaking oil, you'll see it and also have a relative idea of where on the engine it's coming out. Since you say there are no leaks though, the oil has to be going somewhere, and the only other places to go would be into the coolant or into the cylinders.
If the engine is losing compression through a tear in the gasket, your transmission may shift more often, especially downshifting when you try to accelerate while already moving - the truck will sense that you're not making the power that you need to accelerate, so it'll drop a gear to try and get the revs up and make the power you're asking for.
With the recent work on the truck (intake manifold gasket) it's possible that it wasn't installed correctly and has a leak. A vacuum leak would definitely cost you power, and the transmission would also shift more as the leak will mislead the computer with what is going on in the engine. Check as well as possible to make sure the gasket is installed smoothly with no folds or tears. Also, look carefully around the area of the manifold and make sure that all hoses and sensors in the area are plugged in. If they had to be undone to change the gasket, there's a chance they weren't reinstalled correctly.
For about $25 you can buy a compression tester and check each cylinder yourself (it's very easy to do). This would tell you right away if the rings are good and the engine is sealing up. You can also have a leakdown test done at a garage, which will tell you whether the valves are seating and sealing properly. Discrepancies between cylinders on either test should be small for example, on a compression test, there's a range of compression numbers that are acceptable (I don't know them for your truck, but go to Barnes and Noble or a parts store, grab a repair manual for your truck, and check the specs). All cylinders must fall within that range, with no more than a certain percentage deviation between the lowest and highest compression. If one of them is drastically different than the others, that's your problem cylinder.
Posted on Aug 02, 2008
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