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07-12-2015, 11:49 PM
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#1 |
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Registered User
Join Date: Nov 2009
Location: Parachute, CO
Posts: 183
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87 Suburban running rough
I have an 87 3/4ton Suburban. It is idling terrible. It will idle fine then jump up in rpms. If you blip the throttle it will idle fine again for a bit. Driving on the road it has a slight miss at part throttle at 35mph and lower. On interstate it is fine.
Now about a yr and half ago it was running terrible. So I did a good tune up. New plugs and wires. Helped but didn't fix. Had no codes. So I started changing sensors. Put a new (not rebuilt) distributer in. New o2 sensor,new coolant temp sensor, new IAC valve. Rebuilt the throttle body. No change finally found 2 of the new plugs were bad from the factory. Back to current issue. It threw 2 codes. Map voltage high and o2 reading rich. Put new Map in ran better but not fixed. I don't know where to go now. Any suggestions?
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1984 1ton 4x4 crew cab dually 6.2 diesel,465,205,D60,D70,1987 3/4ton 4x4 suburban 5.7 FI350,TH400,208,1985 CJ-7 FI406,465,205,D60,FF14, 1970 Jeepster 350,465,205,D44,FF14, |
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