D_jet trouble shooting question - car is home, journey continues, June, update- no more problem-- the fix was simple.... |
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D_jet trouble shooting question - car is home, journey continues, June, update- no more problem-- the fix was simple.... |
DRPHIL914 |
Dec 15 2014, 12:39 PM
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#1
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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 |
OK. car has been in shop for the past week, and today Bob spent several hours on it but what he found was when the MPS is disconnected from the vac hose it will idle and run, but when it gets connected it goes immediately lean and dies, and will not run with that hose on there- the MPS holds Vac no loss of pressure, but that doesnt mean that its not bad.
1- i thought that if an MPS went bad it defaulted rich? but when this is getting vac it goes lean right away and dies. but it will run and idle with out the vac , the AF meter then shows 9.8-10.2 or so which is of course rich but not flooding out. so the question is why is it going lean when hooked up? when this issue started about 2 weeks ago, it had been running just fine and all of a sudden it quit running. 2. could there be another issue we dont see that would be making it way to lean other than the MPS? might need to test another MPS, my 2nd one i just bought from someone here and it has never been opened but will not hold vac (slowly looses vac pressure) so it probably need to be opened and re-sealed. not a good candidate to trouble shoot with. ------ FYI- 1975 d-jet 2.0. newer wiring harness , CHT is newish(replaced 2 months before this issue started and was running perfect at that time) |
DRPHIL914 |
Dec 27 2014, 10:57 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 |
Any news? So I have not been able to try out the mps that you sent to test until today. The car started but was a bit rough at first. I let it warm up and see where the idle would settle to and see what the A.F. meter was reading then took it for a drive around the neighborhood. Upon starting the a.f. reading was 10, after warming up went to 12-12.5 during drive on acceleration it was reading about 15-16 ,y cruise was about 13.5-14. . This is a never opened or adjusted one from Kevin (rhoadguy) Buy I think I can say that this thing is still not running right. There is something else causing problems. It just does not run smooth, feels like it misses here and there. Yes my other MPS was a major cause of it not starting but there is something else going on here too that I have not figured out yet. It will be running fairly well and idling and suddenly the idle drops l I me it's going to die. Also feels like it's misses or skips here a ND there. Almost like a short. Now that I have an mps that is known good, I may have to go back thru and try a couple things like plug wires, points etc. I should get a chance to test a few things tomorrow, might even hook up the spare ecu. I might even try some other plug wires |
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