Author Topic: Ran down the road...suddenly noise and it was dead...  (Read 6747 times)

Reply #30June 19, 2010, 06:43:40 pm

Runt

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Re: Ran down the road...suddenly noise and it was dead...
« Reply #30 on: June 19, 2010, 06:43:40 pm »
What I noticed.
It misses. When accellerating it honestly feels like it's a gas car with a spark plug missing....kinda like a bad coil pack or something.
Also...when floored in gear, it starts good, bogs down a little/misses/ then on the top end of the gear starts to pull good but by then it's time to shift. Rinse repeat.

Last thing I noticed. When I got home and let it sit...I tried to restart and no go. Noticed a TON of smoke and it almost caught but never did. Turned the fuel screw out 1 full rotation to lean it up and it cranked right up.
Ok, I'll try a couple of thoughts here. 
First, your last start.  Dialing the fuel screw out sounds right, I'd likely return it to it's original setting, and then readjust from there.  You opened it up to compensate for a fuel starved pump, and now that you have that problem solved, you needed to return it to the proper setting, as it was flooding the engine on restart.
The bog/miss MAY be partially related to the excess fuel, and may be somewhat better as the fuel screw is returned to original setting.
I would guess from the info you have given that it is a combination of two factors though: injection timing (dynamic), and possibly one bad/sticky/dirty injector.  The timing is one of two things that are variable due to RPM, and if it was not advancing fast enough, or too fast, then it could cause problems in the midrange that corrected as the RPM and the timing came back closer together.  Search for posts on the IP internal pressure and timing for more info on this, If you were starving the pump it may have weakened the vane pump, although I'd personally try running it for a little while to see iof it seats back in.  The other thing that can vary is cylinder pressures, as boost varies with rpm, I'll mention that again in a minute.  As for the injector, I'd suspect the one in the cylinder with lower compression.  Do you have the ability to pull that one and have it pop tested?  Lastly, it is possible that the one cylinder with low compression doesn't have the oomph to fire until the boost comes up, although I would expect that to show up as a miss at idle, and especially cold starts as well.
I hope that some of this might help your thought process.  Basically, I'd reset the fuel screw, drive it a little, and then check pump pressure and the one (or all) injectors.
One DD 92 Jetta, One 91 Collision write-off, and One 92 rust free shell, beautiful, stripped, waiting for diesel-ization.

Reply #31June 19, 2010, 08:26:43 pm

vdubspeed

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Re: Ran down the road...suddenly noise and it was dead...
« Reply #31 on: June 19, 2010, 08:26:43 pm »
Thanks for the replies.

Worth noting. During the comp test today, cyl 4 which was the lowest was also the cleanest. Cyl 1 which was on par had a ton of oil on the injector.

I also tried to go back to pre-incident settings. And if I do...it will NOT rev up.

Lastly...what is a voltage drop? I have a big battery in there and decent grounds but I guess I could beef em up a little. Is that what you are talking about?

Thanks,

Jason

Reply #32June 19, 2010, 08:46:04 pm

burn_your_money

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Re: Ran down the road...suddenly noise and it was dead...
« Reply #32 on: June 19, 2010, 08:46:04 pm »
How to perform a voltage drop test

Do it with the engine hot if you can
Tyler

Reply #33June 20, 2010, 01:25:34 pm

vdubspeed

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Re: Ran down the road...suddenly noise and it was dead...
« Reply #33 on: June 20, 2010, 01:25:34 pm »
no voltage drop.

Here's where it stands currently.

Has no problem idling now. Actually idles PERFECT with the line pump out of the way. It's the best it's ever been.

To get decent power out of it and for good cold starts...I have to turn the fuel screw in a little.

To get good hot starts, I have to pull it out some and it still blows a cloud of grey smoke.

Also...the advance lever makes NO difference in performance. The motor feels like it never advances.

I know the pump is a rebuild from Prothe. It has never leaked but even before the incident...I never had great performance from it.

Reply #34June 22, 2010, 03:40:39 am

smutts

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Re: Ran down the road...suddenly noise and it was dead...
« Reply #34 on: June 22, 2010, 03:40:39 am »
It might be worth undoing the outlet banjo bolt and looking at the gauze filter that hides inside the bolt, if it is full of metal flakes, doom is in the injection pump. :(

Reply #35June 22, 2010, 03:46:30 pm

Rabbit on Roids

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Re: Ran down the road...suddenly noise and it was dead...
« Reply #35 on: June 22, 2010, 03:46:30 pm »
oh man, thats a prothe ip? theres your problem right there. he doesnt know how to build a pump to save his life.. i think there are 2 pumps on record that actually "kinda" ran. most dont even work right when you buy them, they get shipped broken.