4x4 trouble and other things


Michael_Lambert
03-22-2005, 06:42 PM
My first problem is that my 1993 GMC Jimmy with 138,000 miles will no longer go into 4Hi. It will go into 4Lo though. What could be wrong?

Also, my jimmy does run a little rough and does not seem to have full power. I have had the egr valve cleaned before, and the fuel injectors have been replaced. I'm thinking about trying a new catalytic converter, but maybe my egr valve needs another cleaning. I know that its located near the intake manifold, but where is that? If anyone could tell me where it would be specifically and what it looks like it would be appreciated.

Thanks.

94 Jimmy
03-23-2005, 05:06 PM
Mike
I'm going to make some assumptions, if your Jimmy is like my 94 the EGR is under and slightly to the left of the Throttle Body. The Throttle Body is the part that the air intake from the air cleaner.
I would recommend you get the Haynes service manual for your truck, it's only $20 and will help you through a lot of problems.
What engine do you have, is the rough running at idle, full throttle, cruse or where. These vehicles have a component in the fuel delivery system refered to as the CPI(Central Port Injector) that tends to leak fuel into one side of the V6 which makes the idle rough and unstable. If you can give us some more info, perhaps we can come up with a better solution.
For your transmission, try lubricating the linkage to the transfer case, if your not sure where it is when you have the oil changed tell them to lube all of the transmission linkages.
This is a good start, Good Luck
94

Michael_Lambert
03-23-2005, 08:20 PM
Ok well my engine is the 4.3 Liter V6 Vortec. It just runs a little rough while idling. Also, today I went to Auto Zone and picked up the EGR valve they said was for my Jimmy. I have found the EGR but it does not look like the one they sold me. It looks like this one--- http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33607&item=7963835291&sspagename=rvi%3A1%3A3v_home

I'll look into those other things too. Thanks.

Michael_Lambert
03-23-2005, 08:28 PM
Well I'm sure now that they sold me the wrong one. The one i need is the other 200 dollar one. Guess I'll have to just return it and clean the old one out.

BlazerLT
03-24-2005, 11:57 AM
do a full tuneup.

Search the blazer section for 4x4 and you will find many fixes and solutions for 4x4 problems.

94 Jimmy
04-04-2005, 04:58 PM
Just reading this again and thought about the ign wires. I believe that they should be 4-5 KOhm/foot, but if you have one which has a high resistance with respect to the others, get a new set. If you have'nt changed them in the last 50K Mi, get a new set. If you do a full tune up and that dosen't help, ...... . Also, how old is your O2 Sensor, it can make you engine run rich/lean if it has changed its calibration.

If you think it's your EGR, before spending $150 (Rockauto.com) try cutting a piece of aluminum and putting it between the EGR and the engine. If it helps it's the EGR, if not save $$$. You might get an EGR code but that will clear after a while when you remove the plate.
94

BlazerLT
04-04-2005, 05:46 PM
Just reading this again and thought about the ign wires. I believe that they should be 4-5 KOhm/foot, but if you have one which has a high resistance with respect to the others, get a new set. If you have'nt changed them in the last 50K Mi, get a new set. If you do a full tune up and that dosen't help, ...... . Also, how old is your O2 Sensor, it can make you engine run rich/lean if it has changed its calibration.

If you think it's your EGR, before spending $150 (Rockauto.com) try cutting a piece of aluminum and putting it between the EGR and the engine. If it helps it's the EGR, if not save $$$. You might get an EGR code but that will clear after a while when you remove the plate.
94

Wrong, blocking off the EGR will cause the EGR code to set which will have the computer trying to find the reason and causing a whole bunch of problems.

The EGR valve is there for a reason. Without it, your combustion temperatures will increase causing detonation which will have the knock sensors compensating by retarding the timing and hindering performance and fuel economy.

You don't just block off a component and think the computer will eventually get bored and forget about it.

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