A377 SAS Posted October 16, 2010 Share Posted October 16, 2010 1986 2.0 GTE won't start or, if it does, the engine dies once you give it revs. With the large air pipe disconnected from the injection unit, the engine will start and run perfectly for about 1 minute. It will then start backfiring, belching black smoke from the exhaust and won't take any revs. Could this be the ECU slowly realising that it's getting too much air then adding extra fuel to compensate, causing the rich mixture? Do I need a new Air Flow Meter? Thanks. John. Quote Link to comment Share on other sites More sharing options...
mantadoc Posted October 17, 2010 Share Posted October 17, 2010 The car should idle ok with its wire disconnected and throttle closed. However, the time to missfire you are talking about is exactly the time taken for the cold start to cut out and the auxiliary air valve close. There is no self tuning on the Jetronic. Quote Link to comment Share on other sites More sharing options...
A377 SAS Posted October 17, 2010 Author Share Posted October 17, 2010 Thanks, Mantadoc. PM sent. Quote Link to comment Share on other sites More sharing options...
A377 SAS Posted October 23, 2010 Author Share Posted October 23, 2010 Now thinking it's the cold start thermo-switch. Car would start cold and run perfectly for 1 minute then start backfiring, smoking and cut out. No way it will then start for about 30 minutes when it will run for another 1 minute before cutting out. Tried a replacement Airflow Meter - still the same. Tried a replacement Brain - still the same. But when I disconnected the cold start thermo-switch (the big upright sensor on the injection manifold), the car started and ran, and ran perfectly. It even starts in the morning with this switch disconnected. I reckon the thermo-switch is stuck open and over-fuels the engine once it warms up, hence the backfiring and black smoke. It then takes 30 minutes for the engine to cool down sufficiently to start again with an enriched mixture. After 1 minute of warming up, the engine is again being overfuelled and cuts out. Funny that the car will start from cold without this switch connected tho' ....... Quote Link to comment Share on other sites More sharing options...
mantadoc Posted October 23, 2010 Share Posted October 23, 2010 Earned my money for the day, going home. Quote Link to comment Share on other sites More sharing options...
A377 SAS Posted October 23, 2010 Author Share Posted October 23, 2010 Yeah, thanks once again, Mantadoc. Would never have thought of looking at the cold start sensor. Quote Link to comment Share on other sites More sharing options...
mantadoc Posted October 28, 2010 Share Posted October 28, 2010 If you're further from here than Northern Island I have a new long range psychic diagnosis record Quote Link to comment Share on other sites More sharing options...
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