1993 Chevy Blazer 93 S 10 Blazer with the infamous CPI

Tiny
MLRTME
  • MEMBER
  • 1993 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 50,000 MILES
I have a 93 Blazer with the 4.3 CPI and I have not had any trouble with it since I got it 6 years ago. Recently the vehicle sat for over a year and then the first time it was drove after that was a 850 mile trip where I got 25 miles to the gallon, I did the normal things to try to make sure it would make the trip changed the oil, air filter, checked the air pressure and all that good stuff. I went from ND where the altitude was around 1,000 ft. When I got to where I was going I am now at almost 7,000 ft. It ran like a top for the long drive and for the first two days here but all of a sudden it started running really rough at idle only. When there is pressure on the gas pedal it seems to run fine but as soon as I let off it starts to spit and miss and sometimes it dies when it dies there is no starting it until I unhook the battery and let the computer reset. I got a error code saying that it was the map sensor so I replaced that and nothing changed now it is giving me an error code of 32 which from the book that I used there is no code 32 for this vehicle I took the motor apart to look at the injector and plastic fuel lines to see if there was a leak or anything inside the engine and there was a little gas sitting in there. Then I turned the key on to prime the system to see if there was a leak while under pressure but there was nothing I cleaned it out and tried it again and there was no gas in there the next thing I was thinking of replacing is the egr valve but that part is kind of spendy for this motor and I would like to stay away from replacing parts I dont have to. If there is anyone who has had similar problems or anything like this happen and know what might be wrong with it please help me I love the vehicle and do not want to get rid of it. It also does loose vacuum sometimes while driving but that comes and goes Please Help Me!
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Monday, September 29th, 2008 AT 9:54 PM

3 Replies

Tiny
SWILLIAMS
  • MEMBER
EGR is stuck open with a chunk of carbon. VERY common problem on the early 4.3 engines. Head to your local parts store and get a screened gasket for the EGR. Any place that has the HELP line can get it if they don't have it on the rack. Now remove the EGR valve and clean the pintle and seat to remove the carbon chunks. While you have it off you can also use a stiff brush to break some of the other carbon loose in the intake manifold. Start the engine and the exhaust will blow the loose stuff out in a couple seconds. Now reinstall the EGR with the gasket in the hole in the intake. Now clear the codes. Should take care of the problem.
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Thursday, October 2nd, 2008 AT 10:50 PM
Tiny
MLRTME
  • MEMBER
Thank you very much SWilliams there was two big chunks of carbon holding open like you said but then I think I ruined the valve I cleaned it out with brake parts cleaner. I bought a chiltons manual after I did it and it said that you are not supposed to use anything like that on the valve. So after I cleaned it I put it back together and started it, it ran great better than it did when I started having problems, then when the engine warmed up I stepped on the gas a little to bring the rpms up and when I let off it died on me and I have not been able to get it to start, it will crank all day with no sign of wanting to fire. Would the egr valve do this? And should I be getting a code from that because there is nothing I have checked it a couple of times.
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Monday, October 6th, 2008 AT 8:00 PM
Tiny
SWILLIAMS
  • MEMBER
The EGR alone shouldn't cause a no start. Check for spark at the plugs and see what the fuel pressure is. It is possible that the pump failed or that a fuse blew. Also possible that the ignition module went out.
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Thursday, October 9th, 2008 AT 12:37 AM

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