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Author Topic:   My Hauler is a Peice of Junk!!! Help!
Rook78
Dirt Maniac

Total posts: 106
posted March 10, 2005 09:04 AM  
I posted this in Hauler Tech, but thought I would post here as well. Thanks in advance.

I got an older Chev Suburban '88 the motor is not the original motor, and I am not sure yet anyway what year it is. 350 vortec. The dang thing runs ok most of the time, but sometimes the check engine light comes on and it loses power. Also when warm, it will not stay running at stop lights.
Last summer, I removed the vacuum line from the EGR while it was running poorly. The idle smoothed right out. I tried changing changing the EGR valve but it has the little washers that go inside and did not know which one to use, and it would not run at all with the one i tried. The old one does not have one in it so I tried that as well, no change.

I also changed the EGR solenoid and that did not resolve any issues. I have had it scoped and tested with no apparent failure codes. Any ideas whatsoever would be appreciated.

Thanks
Rook


leapinlizard
Dirt Freak

Total posts: 402
posted March 10, 2005 09:25 AM  
First of all, make sure it's in a good state of tune. Plugs wires cap and such, then eliminate ANY possiblity of vacuum leaks. after that you can probe the O2 sensor with a DOM and look for numbers around .4 to .8 millivolt's. It's about twelve dollars for a new one so if money allows it's better to just change it. Then check all connections for dirt and damage, then use dialectric grease on all connectors that go to and from the computer under the dash and any you find under the hood dealing with fuel or ingnition. Then clean the **** out a the injector throttle body. And clean the area in and around the EGR. After all that, you will find the problem most likley. If not, Start looking for bad sensors. Sounds like it's a coolant temp sensor to me. You can probe it with a DOM as well, look for a variance of voltage between cold engine and a hot engine.

dirtmod0
Dirt Maniac

Total posts: 143
posted March 10, 2005 09:30 AM  
check ur intake egr passages have seen a few where they will actually build up junk and plug the intake and like ****. coolant temp sensor maybe may check ur plugs for signs of to much fuel.

GRTWallbanger
Dirt Maniac

Total posts: 196
posted March 10, 2005 11:46 AM  
When the check engine light comes on?What codes you getting?I bet you have one for O2 sensor?I would also check more into the EGR vavle and/or passage.Our hauler was loosing power all summer until i finally tuned her up and replaced the O2 sensor and the EGR vavle.It went from running MAx of 55mph to doing 70 no problem.

Rat Trap
Dirt Maniac

Total posts: 129
posted March 10, 2005 02:30 PM  
Hey if you don't get it figured out from help here at this forum go to http://www.chevytalk.org/threads/postlist.php?Cat=&Board=UBB70

I know they will figure it out, In fact doing a search on it will from there forum will more than likely help you.

I-B-RACIN
Dirt Maniac

Total posts: 132
posted March 11, 2005 08:27 PM  
those motors are natorious for magnatising the distributer shaft and cause all types of power problems maybe the egr is not the problem at all not a whole lot of those acctually go bad unless its stuck open in that case you will have a hard brake petal pull the rotor off and see if a feeler gauge sticks to the shaft if it does its junk when it magnatises it will accutually cause the computer to not advance the timing hope this helps

[This message has been edited by I-B-RACIN (edited March 11, 2005).]

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