D-Jet Problems, Stalls when hot, misses at med. rpms |
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D-Jet Problems, Stalls when hot, misses at med. rpms |
john_g |
Mar 27 2015, 09:28 PM
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#1
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Member Group: Members Posts: 110 Joined: 1-November 12 From: british columbia Member No.: 15,100 Region Association: Canada |
I'm having problems that I'm pretty sure come from somewhere in the D-jet system. I have a '74 914, bored to 2056. Here are my symptoms:
It idles okay. It's a bit rough when cold, but it doesn't cut out on me and warms up to a steady idle quickly (1200 when cool, 800-900 when warm), but when it's been run for a longer time and is good and hot, the idle drops well below 800 and it stalls. It'll start back up right away but only if I treat it as if it's flooded - I have to put the accelerator to the floor as I restart it. Secondly, at mid rpm's, between 2200 and 2800, it hesitates, sputters, misses, and occasionally backfires - this happens whether it's cold or warm. What I've done or have had done: usual tuning routine replaced the CHT sensor replaced the MPS replaced the distributor cleaned the PVC valve checked for vacuum leaks checked the TPS, it seems good Two air-cooled mechanics with good reputations have worked on it and haven't been able to solve the problem fully. All the above helped a bit, but the situation is still there. There has to be some sensor that isn't reading the situation correctly. Any ideas, or ... has anyone had a similar problem? (IMG:style_emoticons/default/confused24.gif) |
Java2570 |
Mar 28 2015, 03:15 PM
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#2
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Senior Member Group: Members Posts: 649 Joined: 7-May 11 From: Fishers, IN Member No.: 13,035 Region Association: Upper MidWest |
I would absolutely make sure that your wiring harnesses are in good shape....sometimes they can have breaks or bad spots in wires and can cause all sorts of gremlins. It would be a great idea to get ohm readings with a multimeter on your CHT for cold and hot values....that way you know for sure if the CHT is working correctly for cold and warm conditions. The webpage that Boxsterfan mentioned has a ton of great D Jet info and lots of tips and tests you can use to diagnose these sorts of issues.
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