Chev Vans Car Answers2003 Express Van Engine DimmingMy vehicle is miss firing. I also miss fires at very low speed. My mechanic thought it was the map sensor but its not he got a decoder for it and it says the problem code is P003. He changed the spark plugs, and clean the injectors. How can he fix that problem?Get Answers About Your Chev Vans1978 G+Series Van Engine OtherChevrolet 400 motor would run well only when timed at approx. 20 degreses BTC. for last month. Had new long block built. Same situation. Checked for TDC with pencil in #1 and found balancer and timing numeral plate seemed to line up perfect at 0. Does this indicate timing gear installed properly? Removed balancer and found it matched up correctly with new one in relation to mark and keyway. Placed back on, same problem. Had distrutor placed on machine at auto repair facility and it checked ok. Replaced distributor. Same problem. Checked routing of vacuum lines with Mitchell Manual. All appeared correct. (Backfires at 4 degree markand runs ROUGH). Still runs ok @20 degrees. Can't pass smog with this timing condition. Machine shop "re-clocked" distributor drive. Same condition. Maximum intake manifold vacuum is @ approx. 20 degrees BTC.1983 G+Series Van Chassis, Suspension & Steering MalfunctionI have a right caliber that appeared to froze up. I have replaced it and bled lines. Took out for a test drive and the same condition still exists. Is this a failure mode of the proportioning valve? Number two is this resetable. And if not where can a get a rebuilt and new one. |
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