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jbyrd
New User
Sep 25, 2009, 6:17 AM
Post #1 of 2
(2023 views)
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runs rich,no codes
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98 s-10 blazer 4.3, idles and rev's smooth & no codes. try to drive it and runs really rich & ruff! cleaned MAF with brake clean,new plugs cuz they were fouled from fuel & wouldnt start,&fuel pressure is good! fuel pressure holds & doesnt drop more than it should after engine is off. what is wrong???
(This post was edited by Hammer Time on Sep 25, 2009, 7:12 AM)
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Jeff Norfolk
Enthusiast
Sep 26, 2009, 9:47 AM
Post #2 of 2
(2008 views)
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Re: runs rich,no codes
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Some running data would be helpful is you have the ability to see that with a scan tool. If not try a new thermostat. If thermostat is stuck open the engine will not maintain normal operating temp and cause the ECM to compensate. These have a pattern failure on the coolant temp sensor also. When they fail they will fail to -40F and cause a rich or even a no start (but that is unusual).
Jeff
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