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#11
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dave wrote: > "Rex B" > wrote in message > ... > >>dave AKA vwdoc1 wrote: >> >>>I have seen some cats that have lost their guts through the exhaust but >>>the engines were still running fine with the 02 sensor online. >>>I have also seen many 02 sensors installed in exhaust pipes, so they are >>>not in the exhaust manifold nor cat. >>> >>>Just try yours and see. ;-) >> >>The tech told me his milliammeter would not come up into the working range >>because the O2 sensor was not getting hot enough, so it needed a new cat >>before he could tune it. But honestly I did not try it myself, nor did I >>verify that the heater circuit was working. I will do that, thanks >> >>Rex > > > Well that is a possibility, but I would have to see that myself. You can > plug into the FPR, jump the fuel pump relay, turn the ign. on and read the > current without the engine being on. At least that is what I remember and > I usually do this to vehicles that don't start. :-) > Remember that I am NOT plugging into the 02 sensor but the Fuel Pressure > Regulator wiring. I guess you use that standard test harness that you use to check millamps through the FPR? |
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#12
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I adjusted the mixture screw last night until I could blip the throttle
without it trying to die. Then I drove it around the neighborhood a bit, and it seemed to drive pretty well, although it was not perfect. Once it got over about 5000 at WOT it really came alive, something it has not done well since I've owned it. It may be still too lean, and it has that odd smell that I used to associate with incorrect ignition timing. Additional tuning is indicated, but I am going to try and leave that for the next owner. Thanks much to Dave and others for your help. - - Rex Burkheimer WM Automotive Fort Worth TX Rex B wrote: > OK guys, here's where I'm at now with this (formerly) dead VW: > > After going through everything from air cleaner to intake, repairing > what little I could find wrong, replacing all suspect vac hoses, and > fixing one vacuum leak, I got it where I could drive it - barely. It's > obviously running way lean, because once I get the throttle into the WOT > enrichment, it wakes up immediately. > I know the rice-rocket shop turned the fuel distributor adjustment > screw a bunch, not knowing what they were doing. My question is, does > that have an effect on the basic running mixture (as opposed to idle > only)? Can I expect to crank the 3mm adjustment screw a little at a > time and bring the mixture into a drivable range? > I know the correct way to do this is with an ammeter reading the o2 > sensor circuit, but the o2 sensor does not get hot enough to operate for > this purpose. Remember this is a race car, and most people racing these > effectively bypass the o2 sensor and treat it as a straight CIS system. |
#13
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"Rex B" > wrote in message ... > > I guess you use that standard test harness that you use to check millamps > through the FPR? yeah I build up something from some spare plugs off of another wiring harness. |
#14
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Followup.
OK, the car ran well after adjusting the mixture by feel. Called the buyer, he was tickled, and drove it home (not tags, no inspection, roll cage, a little loud) to north Dallas. Called and said it wouldn't idle nor rev over 3000. Sigh. Next day he said he found a cracked plastic piece where the injectors enter the intake manifold. He is going to get all new pieces to seal the injectors today. I think he is onto something. - - Rex Burkheimer WM Automotive Fort Worth TX dave AKA vwdoc1 wrote: > "Rex B" > wrote in message > ... > >>I guess you use that standard test harness that you use to check millamps >>through the FPR? > > > yeah I build up something from some spare plugs off of another wiring > harness. > > |
#15
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BTW I have seen bad injectors do that also.
It all depends on what is marginal on the car. If too many things are marginal they can all add up to a poor running vehicle. :-( Could be clogged screen on the intank fuel pump, or clogged inlet to the main fuel pump housing, or or or.......... keep us informed if the problems are found! "Rex B" > wrote in message ... > Followup. > OK, the car ran well after adjusting the mixture by feel. Called the > buyer, he was tickled, and drove it home (not tags, no inspection, roll > cage, a little loud) to north Dallas. Called and said it wouldn't idle > nor rev over 3000. Sigh. > Next day he said he found a cracked plastic piece where the injectors > enter the intake manifold. He is going to get all new pieces to seal the > injectors today. I think he is onto something. > - - > Rex Burkheimer > WM Automotive > Fort Worth TX >> |
#16
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That's the direction I was going when it started running.
Had it not run OK, ignition was next. Injector seals would have followed after that, then injectors. I'm pretty sure fuel tank, both pumps, fuel distributor assembly throttle body are fairly correct. - - Rex Burkheimer dave wrote: > BTW I have seen bad injectors do that also. > It all depends on what is marginal on the car. If too many things are > marginal they can all add up to a poor running vehicle. :-( > Could be clogged screen on the intank fuel pump, or clogged inlet to the > main fuel pump housing, or or or.......... > > keep us informed if the problems are found! > > "Rex B" > wrote in message > ... > >>Followup. >>OK, the car ran well after adjusting the mixture by feel. Called the >>buyer, he was tickled, and drove it home (not tags, no inspection, roll >>cage, a little loud) to north Dallas. Called and said it wouldn't idle >>nor rev over 3000. Sigh. >> Next day he said he found a cracked plastic piece where the injectors >>enter the intake manifold. He is going to get all new pieces to seal the >>injectors today. I think he is onto something. >>- - >>Rex Burkheimer >>WM Automotive >>Fort Worth TX >> > > |
#17
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Either not enough fuel getting inside the cylinders or possibly a clogged
exhaust system. I had a collasped rear muffler on my 91 Passat. It did not run well at all that way. lol later, dave (One out of many daves) > > "Rex B" > wrote in message > ... >> Followup. >> OK, the car ran well after adjusting the mixture by feel. Called the >> buyer, he was tickled, and drove it home (not tags, no inspection, roll >> cage, a little loud) to north Dallas. Called and said it wouldn't idle >> nor rev over 3000. Sigh. >> Next day he said he found a cracked plastic piece where the injectors >> enter the intake manifold. He is going to get all new pieces to seal the >> injectors today. I think he is onto something. |
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