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) |
DRPHIL914 |
Aug 28 2015, 12:34 PM
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#2
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Dr. Phil Group: Members Posts: 5,767 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
when i first had my MPS rebuilt then set to factory specs, i had very lean running and even surging at idle , my first corrections were too much and i was very rich, and had that low idle, stall issue. so ive been slowly working it back toward those numbers. Las year at Octeenerfest i was really , under load, too lean and as i accelerated up hill hard it was maybe 15 or so. now its more in that 12.8 range and should run more cool as well when under load. but one factor in my running rich was that i found out that the shop after setting the valves for me did not have the timing set correct. as soon as i set it for the 27'btdc, (they had it set at zero) this put me even more riche and i had to go back and readjust the mps again to lean it back out just a bit. and of course i was running hotter from being too advanced and my idle was too low - now, idle is right at 950 warmed up, it doesnt try to die, running about 10-15 degrees cooler on oil temps and A/F is just about perfect. - it only tooke me 3 years to figure it out, lol!!
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