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Old 01-19-2010, 08:05 PM   #1
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Need Help Please

Ok heres the deal. I drive a 2004 Chevy Express box van for my job and I cant figure out what is wrong with this. I am the maintenance man for the business too so I would like to fix this myself and make some $$ instead of him taking it to someone and paying alot more $$ than necessary.

Brief description: The van has no trouble starting up and stays running but the engine will begin to idle really low. Normal idle at startup, then the next time you stop, either for a stop sign or light, the idle drops like it is gonna die. Does not matter if it is hot or cold. I usually turn it off and then restart and it runs normal, until the next time you stop. The check engine light does not come on. I have had shops hook up a code reader and nothing (probably because it doesnt come on in the first place).

Also, this van has a MAJOR exhaust leak. The manifold on the right side of the engine is broken. Like it was pulled off, broke like a stick, then put back in. I can replace this but the boss has made me wait for more than a year. Now he is ready to let me do it, but now may be too late. I say that because now at the end of the day the engine ticks loud. Sounds to me like a lifter, but I dont know. Also, some body at the oil change place convinced him to switch from 10w30 to 20w50. It was right around the time the tick started. I dont want to say that is the problem tho, cuz like I have said here before, I dont know.

My wrenching experience is limited to mainly pre 90 vehicles. I dont know the computer controlled vehicles as well as I would like to.

I have done a couple of things to this van in the last few years including 5 new alternators (finally got him to stop buying from AutoZone), water pump, radiator, and brakes. None of which is within the last year. The engine is a 6.0 gas engine. Dont know about tranny, but if needed I will find out.



I hope this is the right place for this thread. All advice and recommendations are appreciated. Thank you all for taking the time to read this.
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Old 01-19-2010, 08:30 PM   #2
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Start with the exhaust manifold. If it is cracked it can let fresh air into the exhaust and throw off the O2 sensor. If it has been doing it for very long it may be time for O2 sensors and maybe cat(s) if they are clogged.

Unless it is very high mileage I would stick with 10w30 oil. I'd even bet the factory recommends 5w30.
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Old 01-19-2010, 08:38 PM   #3
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I'd start with the obvious thing first- fix the broken manifold.
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Old 01-19-2010, 09:48 PM   #4
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Start with the exhaust manifold. If it is cracked it can let fresh air into the exhaust and throw off the O2 sensor. If it has been doing it for very long it may be time for O2 sensors and maybe cat(s) if they are clogged.

Unless it is very high mileage I would stick with 10w30 oil. I'd even bet the factory recommends 5w30.
The engine has 319000+ on it. I am gonna fix the manifold as soon as possible. The boss seems to think it doesnt matter. I really dont like working on vans but I will do it. I only want $100 for doing it. The shop want $1000. The manifold is only $200.
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Old 01-20-2010, 12:18 AM   #5
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damn you work cheap...lol
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Old 01-20-2010, 06:12 AM   #6
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Yep, manifold. The longer it goes the worse it will get.
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Old 01-20-2010, 06:54 AM   #7
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Good luck. It would take $100 for me to look under the hood of a newer van....any wrenching on a van brings double the $uk IMO
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Old 01-20-2010, 08:40 AM   #8
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give the mass a/f sensor a look too and if the manifold dont work i can almost assure its the throttle body being filthy, i have had to do this on many of my buddys newer vortec engines. just get all the black suite off the throttle body and it will run like crap at first just give it hell and blow the junk through and it will run like a charm 99% of the time. best of luck
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Old 01-20-2010, 08:46 AM   #9
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apparentley the gmc/chevys are kinda notorious for gettin dirty throttle bodies and acting like that. i dunno if thats true or not i seen it on a chevy forum and gave it a shot on a few different trucks and it worked good.
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Old 01-20-2010, 11:20 AM   #10
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apparentley the gmc/chevys are kinda notorious for gettin dirty throttle bodies and acting like that. i dunno if thats true or not i seen it on a chevy forum and gave it a shot on a few different trucks and it worked good.
Can you send me alink to that forum please? I think cleaning the throttle body would be a good idea anyway.

Yeah I work cheap. Only because I drive this thing and want it fixed. The darn thing has left me on the side of the road before. That was a really long day.

Thanks for yalls input!!
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Old 01-20-2010, 05:49 PM   #11
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i will scrounge it up for ya i cant recall what the name of it is though, i did a google and it gave me about 100 results
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Old 01-20-2010, 06:53 PM   #12
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i will scrounge it up for ya i cant recall what the name of it is though, i did a google and it gave me about 100 results
Thank you.
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Old 01-20-2010, 06:56 PM   #13
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Good luck. It would take $100 for me to look under the hood of a newer van....any wrenching on a van brings double the $uk IMO
I agree. It is a big pain in the booty. Just gotta make it cheap so the job can get done. Besides, when I work on the weekends for them his wife cooks up something awesome. That helps make up for it some.
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