D-Jet Issues-getting close, Need a little more specific advice |
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D-Jet Issues-getting close, Need a little more specific advice |
OU8AVW |
Mar 16 2015, 09:17 AM
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#1
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Yacht Rigger Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region |
So I got my car back from the local Porsche shop and installed a rebuilt MPS from Bowlsby but the car is still not running right. Flat spots and intermittent dead fire misses. She starts right up, idles well and drives ok but when you get on it it has intermittent flat spots and when shes just cruising it misses once and a while. Seems like the advance is not ramping up like it should. Also, the mechanic left a vacuum line off the distributor. The line from the inboard connection on the pot is hooked up but the outside one is off. I understand that one of these is advance and one is retard.
Just need a list of crap to check (IMG:style_emoticons/default/biggrin.gif) |
OU8AVW |
Mar 16 2015, 10:29 AM
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#2
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Yacht Rigger Group: Members Posts: 1,803 Joined: 1-October 08 From: Granbury, TX Member No.: 9,601 Region Association: Southwest Region |
1974 2056. New injectors, rebuilt MPS.....
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worn |
Mar 16 2015, 11:08 AM
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#3
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can't remember Group: Members Posts: 3,156 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
1974 2056. New injectors, rebuilt MPS..... Timing light? Everyone correctly goes after vacuum but I would also check wiring. Two nights ago I had the lid open and saw arcing between a spark plug wire and a vacuum hose! I kept thinking I was making a mistake and it was another spark plug wire. Didn't really want to grab the offending item so I shut it down. Sure enough: hose for the vacuum advance. Black silicone rubber. I can only think that the black is carbon black, which I suspect might conduct high voltage. Misfire went away when I moved the hose. Maybe new HT wires soon?. At any rate I would check all the components including the wires that go to them such as the aux air, the throttle sensor, the temp sensor connections, and of course the MPS. One problem I had once was a leaking cold start valve that dribbled gas into the induction system at random. A flashlight peak through the throttle body would show wet gas in the plenum. So many piddly little things. Good luck BTW, how does Rich look for the leaks? Propane? |
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