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Engine Specific Info and Questions => IDI Engine => Topic started by: Rabbit on Roids on March 04, 2009, 10:54:26 am
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ok, the best way to describe what my engine does, is to say that it pings. but its only at pretty high rpms and only between shifts or if you are going over 65 at part throttle with almost no load on the engine. its got stock N/A pump and infectors and lots of boost. im 100% positive my timing is off some. i just time all my engines by ear. but what can i do to get rid of the annoying ping? it sounds as the timing advances a ton after every shift. i figure its gotta be something to do with the pump or injectors, cause those are the 2 things i understand the least, and my engine only has about 1k miles on the bottom end.
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how old are the injectors?
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i have no idea. the bodies are still super clean. its done it with both sets of injectors. (both stock 1.5 infectors) i also have a set of turbo injectors. i was wondering if swapping those in might fix my problem? they were rebuilt and balanced about 10k miles ago the PO told me.
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Have you done any mods to the pump? Like the GOV.mod or adjusted the fuel screw.
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yea, the fuel pin is all the way in and then some.. i took the collar off so i can thread it in way farther. i didnt turn it in much past what the collar allowed. i also backed the max speed limiter screw way out. and i set the idle pretty low too. but besides that the pump is stock. no gov mods (yet). and i plan on putting my lda top on this pump and removing the fuel limiter pin.
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I'm not an expert on pumps, but maybe your pump, the way you've adjusted it, is giving it the extra amount of fuel off boost and posably even tip in throttling?
I kind of had the same issue's before I changed out the NA pump for the TD pump.
Just a thought.
Side note: Where in Oregon are you located?
Me, Portland
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lol, your in portland? im about 75 miles west. i live in astoria. and it probably is the pump. its an old unit with an unknown history, and come to think of it, its only did it since i had this pump on there. i have a turbo pump i franken-ized because the input shaft bushings were wiped out. basically i took EVERYTHING (besides the lift pump and governor gears) out and put all the TD pump guts in it. but when i put it on, it ran like a champ, but i didnt have any throttle. not even a little bit. it was just constant idle. and i wanted it to run, so instead of dissecting the pump i built, i just grabbed that pump and threw her on there, cause i knew that pump ran, and i wanted to drive my damn car. i was having boost withdrawls. :(
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Set your pump timing properly and go from there.
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i cant set it properly. i dont own the tools, and im too friggen broke to go out and buy them. all my "special vw tools" are just adaptations of other tools.
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i cant set it properly. i dont own the tools, and im too friggen broke to go out and buy them. all my "special vw tools" are just adaptations of other tools.
I see. Well, you can try to retard the timing a tad and see if it helps. It sounds like it is advanced too much.
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i dunno, would that cause it to start kinda hard when cold? i gotta use my cold start advance lever whenever its below 100* F
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i dunno, would that cause it to start kinda hard when cold? i gotta use my cold start advance lever whenever its below 100* F
It might, but my guess is that it is too far advanced to begin with. Try retarding the timing a bit and see what happens.
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alright, im gonna have to move the IP a tooth back then, cause its already all the way retarded.
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alright, im gonna have to move the IP a tooth back then, cause its already all the way retarded.
Ok, just make sure you can go back to where it was before you adjust it. You really gotta save for the adapter and dial gauge, it'll save you lots of agony. :wink:
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Come to P-town and I'll time it for ya.
Lets see this bad boy TD.
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its not really anything special to look at. straight rust free body. the interior is thrashed, but its got recaros! everything that ive done to it, basically i make due with what i have to the best of my abilities. it needs a cabriolet front end tho :(
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your fuel mix is too lean.
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too lean? i thought you couldnt run a diesel too lean? i can fix the too lean part. ive got a turbo pump and infectors i want to put on it. but my problem is that i cant get anything but an idle out of the pump. no throttle at all.
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your fuel mix is too lean.
pinging is a sign of a lean mixture on a gasser engine. pretty sure it doesn't apply to diesels whatsoever.
diesel pinging is most likely due to a bad injector. if not injectors, it has something to do with the injection pump. a deliver valve could be suspect in this case...
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its done it with 2 different sets of fairly new injectors. and now its becoming hard to start when its cold. have to pull the CS knob and give it throttle to keep it running for the first 5 - 10 seconds. then you let off the throttle and it purrs like a kitten. then after its about 140* i push the CS knob in. i know nothing about the history of this pump, other than i got it from my grandpa and he said it ran on his caddy. when i had my original pump on my car, it would fire up when it was 0* outside. and you wouldnt have to throttle it. and it wouldnt miss when cold either. my engine has an intermittent miss when you first start it up. and like i said, it goes away in about 10 seconds.
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bump
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so it only pings at high rpm? you also said it idles like crap? crack open each injector line (at the injector) one at a time and see if the idle noise changes. if it doesn't, then you've found the suspect injector. even with a good injector, it could be the injector deliver valve. dakotakidd posted a similar issue with a bad delivery valve on the pump (the part sticking out of the pump head, where the injector line connects to) so he changed the delivery valve with a known good one, and the problem went away. this could be happening to you too...
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no, it doesnt idle like crap, it only idles rough for like 10 seconds if its dead cold. and misses also when cold. i know its not missing from low compression, cause its a fresh engine. and ive cracked the lines when it was running to see if it were any differnet, its not tho.