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Car Forum / GMC Cars / July 2006chevy venture missing, jumping (long)
I have a 1998 Chevy Venture minivan with 210,000 miles. For the past seven month, the van has had a miss or stumble that occurs occasionally. It seems to happen most while traveling on the interstate as I begin to go up a grade. The miss happens only one time per hill, it is usually very strong and harsh. I can sometime cause it to miss if I begin to increase the speed as if I had encountered a hill. The gas mileage has not decreased, nor has the power of the motor decreased. No smoke at any time and the van does not burn oil. Other than this single miss every now and then, the van runs great. Things I have replaced or checked: Spark plugs. (AC/Delco plugs) Plug wires, twice. Last time with Delco wires. 7X crankshaft position sensor. Fuel filter. PCV valve. Checked the fuel pressure, it is in spec and seems to change pressure properly. Both oxygen sensors. Catalytic converter twice, last time with a GM converter. New battery. Rebuilt alternator. No codes are stored, the service engine light does not come on. I have an interface and can connect the OBD II to my laptop, but this does not show any problem with the various sensors, and the OBD indicates a "pass" on all onboard tests. Any ideas or help is greatly appreciated, Terry Look at misfire counts as this happens on a full function scanner, try some Chevron Techron FI cleaner, look as s/t fuel trims if you can get this to happen. > I have a 1998 Chevy Venture minivan with 210,000 miles. For the past seven > month, the van has had a miss or stumble that occurs occasionally. It [quoted text clipped - 27 lines] > Any ideas or help is greatly appreciated, > Terry >look as s/t fuel trims if you can get >this to happen. I watched the fuel system trims and they change as I drive, mostly staying in the negative, but they do occasionally go to +2.00 or so as I accelerate. I am not sure what they should be, however. I will try the Chevron Techron FI cleaner, but I did use some gas drier last winter, no change. Thanks, Terry If you have enhanced option on your OBDII scanner check it for misfire counts as Shep said. These wont set a code until they reach a threshold but may give an indication where the problem lies. >>look as s/t fuel trims if you can get >>this to happen. [quoted text clipped - 5 lines] > last winter, no change. > Thanks, Terry > If you have enhanced option on your OBDII scanner check it for misfire > counts as Shep said. These wont set a code until they reach a threshold > but may give an indication where the problem lies. Unfortunately, my scanner seems to not have this option. Thanks for the reply anyway. Terry If your Chevy Venture is missing, then I would call the athorities and report it as being stolen asap. The sooner they know the better chances of getting it back. You say it is also jumping....sounds like a low rider with the air shocks for jumping, but I don't know why you would invest that type of setup in a Chevy Venture. > I have a 1998 Chevy Venture minivan with 210,000 miles. For the past > seven month, the van has had a miss or stumble that occurs [quoted text clipped - 27 lines] > Any ideas or help is greatly appreciated, > Terry I had the same problem on my 97 Trans Sport. New plugs took care of it. Have no idea what's happening with yours, although I am interested in hearing what others may have to say. > I have a 1998 Chevy Venture minivan with 210,000 miles. Have you had the intake manifold gasket checked? These have a nearly 100% failure rate by your mileage. John > Have you had the intake manifold gasket checked? These have a nearly > 100% failure rate by your mileage. > > John Yes, it has been replaced. Terry |
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