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 |
May 8 2015, 12:31 PM
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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 |
I had some time to mess with the FI last night. I found a vacuum leak around the throttle body to plenium gasket. Not having a new one handy I pulled the TB and cleaned the surfaces with cleaner and some sand paper. When I put it back together and started the engine it revved out of control. I reset the TPS, pulled and cleaned everything again. Same issue.
I got in it this morning and heard a click when I pushed the clutch in. The throttle cable was stuck under the clutch armature (IMG:style_emoticons/default/dry.gif) Now the idle can be adjusted with the adjustment screw and she runs a little smoother. It wants to die when the screw is too far in. Next I want to sort the AAR. I like how the car starts with it working. I also bought an LM2 exaust gas analyzer. I'll double check all the vacuum stuff again and see what it's reading. |
BeatNavy |
May 8 2015, 01:22 PM
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#3
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
When I put it back together and started the engine it revved out of control. I did basically the same thing last night and had the same issue. I replaced the TPS board and when I put the throttle body back on and started it I got a horrific whine, almost like a turbine, and the engine would start to rev out of control. Sounds like a massive vacuum leak. Sure enough, when I put the throttle body back on I let one of the washers from the 13 mm bolts that hold it on the manifold get under the throttle body instead of on top. All better now and I think the bucking is gone. |
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