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CHEVY HESITATES AND SPUTTERS

2000 Chevrolet Express

Electrical problem
2000 Chevy Express V8 Two Wheel Drive Automatic 150000 miles

Hello,

My 2000 Express Cargo Van (2500) has a problem.(5.7L, 150,000 Miles, recently tuned with fuel filter, plugs, wires, roter, cap. Oil changed every 10,000 with synthetic.) My wife drove the van from central NC to Northern PA. No problems. On her way home (no load) the Van started to hesitate and sputter. She said it was like the fuel filter was clogged (she has experienced this before with my truck.). It kept running rough so she took it to Goodyear Auto service upon recommendation of Sears. Here, the computer indicated it was a crank position sensor. This was replace and she was sent on her way. About two miles later the van continued it's problem as before. Again the computer indicated a different sensor (don't remember which one) and the mechanic stated that they should have caught that before she left and only charged for parts here. She went on her way and had no problems until she arrive in the center of Washington, DC where the van died in the rush hour traffic. She was towed to a nearby Goodyear auto service center where they started the van and let it run for about an hour and a half. No problems identified and she was prepareing the paperwork to leave when one of the mechanics came to the office and said the van died. The mechanics then searched for the problem. I was told they found some wires on the manifold cover that were burnt and they were repaired. The invoce reads " found and repair shorted wires to manifold.&Quot; She leaves and drives to south central NC with no problems. We think the problem has been fixed (over $500 plus $150 towing plus two nights in motels.). The van sat for about a week and today was driven to western NC with no problems. On the way back the same type problem ocurred again. The van is currently sitting in a parking lot about 2 hours from home. Any suggestions would be most appreciated. Thanks.
Avatar
Ed21
May 8, 2008.



Need to start from scratch and scan the PCM for any codes it may have stored. Knowing the second code would be nice, but we need to know what the PCM is or isnt seeing in the system. What was the second sensor that was replaced?

Tiny
Jack42
May 9, 2008.
I was finally able to find the last invoice for work completed. The second sensor is listed as " CAM Position Sensor.&Quot; Therefore, the Cam positon sensor and the crank position sensors were replaced. I took the van to Advanced Auto and they used the handheld computer to read any codes. The machine stated " It Passed" and no codes were present. I dove the van today to do these things and had no problems. I also had the annual safety inspection completed with nothing other than a brake light bulb burnt out. For short trips, at present at least, it seems to be fine. However, longer trips have shown that there is still a problem and consequently unreliable. Thanks. What else can I do to assist you in answering the initial question?

Ed

Tiny
Ed21
May 12, 2008.
The only thing left it to let the van run until it fails then see what is missing, spark or fuel. If the PCM has no failure record and it is working, there isnt anything to find right now. Unfortunatly sometimes electronics only fail when real hot, as is this case.

Tiny
Jack42
May 13, 2008.
Could it be the computer? How would one find out if it was?

Tiny
Ed21
May 13, 2008.
Could be, but it is a long diagnostic list to go down before you get to the PCM. WHen it fails need to see what is missing, spark or fuel and go from there. If you just start throwing parts at it, it will get expensive fast and who knows how long it would take to eventually replace the correct one

Tiny
Jack42
May 14, 2008.
Thanks for your assistance. I guess my next step will be to take it to the dealer's shop and see what they come up with. I appreciate it.

Ed

Tiny
Ed21
May 14, 2008.
I have a 1999 Chevy Express Conversation van with 140k that was doing the same thing. Small hesitations grew larger. Shop replaced parts. I ran injector cleaner from Texas to South Carolina and back (limping) as the Dealer said those were next on the list. Instead, I found an owner that recommended cleaning the Mass Airflow Sensor. I went to PepBoys and bought some CRC MAF Cleaner spray. I took the MAF sensor out (from behind the aircleaner) and sprayed it heavily. Be VERY Careful. It's just 3 very fine wires with a little transistor in the middle. If you break a wire, you're going to be buying a very expensive part. My sensor wires were indeed black. Spraying helped but still they were not clean. So I used, VERY VERY GENTLY, a pencil eraser and rubbed the wires and transistors (the bump in each wire). They cleaned right up. I sprayed one more time and reassembled. And I have not had one further problem! Van runs like new, seriously! I figured it was very close to going to the junk yard, instead I've put another year on it and still drive it. You're shop will probably not do this for you (they'll want to just replace it), but it is VERY, very simple to do and cost about $8 in cleaner. Go slow and be very patient and gentle.

Tiny
Hopkinstx
Jul 2, 2008.
I neglected to follow up here. I took the van to the dealer. They ran some tests and determined that it was not getting fuel and recommended a new fuel pump. (I have no idea why the guys at both Good year places did not run a fuel supply test.) They wanted between 6 and 9 hundred dollars to replace the fuel pump. Ouch! They said the OEM fuel pump was warranted and the best option. Well, I then took the van back to my regular mechanic (coasted into his driveway) who had just replaced the fuel pump and filter along with a full tune up not long before. He said the fuel pump he replace was still under warrantee so he ordered a new one and replaced it. The warrantee did not cover labor but he split it with me. $65 was my cost. Great guy. Anyway, we have not had any problems with it since then. So Far anyway. If I have any more problems I will try what hopkintx recommended. Thanks.

Tiny
Ed21
Jul 2, 2008.