Injector pump adjustment
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Mountain Pass
Joined: Feb 2012
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Injector pump adjustment
Hey guys, I just bought a 1988 F250 7.3 IDI non turbo(completely new territory for me), and I was wondering where the injector pump was, and how to adjust it.
I think it is on the intake manifold, above the oil cap. Anyways, the boys I bought it from were your typical "I bought a diesel to put Twisted Diesel stickers on, and so I can make it smoke obnoxiously because I think it is cool," and I'm looking to fix this smoke issue, especially because I keep smoking out the neighborhood. The smoke bounces back and fourth from black to brown/tan.
Thanks
I think it is on the intake manifold, above the oil cap. Anyways, the boys I bought it from were your typical "I bought a diesel to put Twisted Diesel stickers on, and so I can make it smoke obnoxiously because I think it is cool," and I'm looking to fix this smoke issue, especially because I keep smoking out the neighborhood. The smoke bounces back and fourth from black to brown/tan.
Thanks
Junior User
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you are correct on the location of the pump. as far as adjusting it, look on the passenger side of the pump down a little ways, their is a trap door held on by 2 1/4" screws. open that guy up and their is an allen adjustment screw in there turn it towards cab to decrease fuel. a little goes a long way. i would suggest 1 flat at a time at the most
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Postmaster
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the kind of guys you bought your truck from are exactly the kind who drive people crazy and make america hate diesel.
black smoke is unburned fuel, grey smoke it partially burned fuel and is common when cold or when the timing is incorrect.
i would bet the PO turned up the fuel screw as far as they could, which i believe is 3 or 4 flats above the stock settting.
it would also be helpful to check the timing, as incorrect timing may be part of the problem. many shops who work on diesels don't have a proper timing meter, so they put it somewhere that looks close enough and nobody knows any better. the optimal setting produces an advance of 8* @ 2000 RPM when measured using a ferret timing adapter and a timing light with digital advance. there are plenty of threads on that subject around here, so i'll let y'all search for that when you're ready to take a look at it.
black smoke is unburned fuel, grey smoke it partially burned fuel and is common when cold or when the timing is incorrect.
i would bet the PO turned up the fuel screw as far as they could, which i believe is 3 or 4 flats above the stock settting.
it would also be helpful to check the timing, as incorrect timing may be part of the problem. many shops who work on diesels don't have a proper timing meter, so they put it somewhere that looks close enough and nobody knows any better. the optimal setting produces an advance of 8* @ 2000 RPM when measured using a ferret timing adapter and a timing light with digital advance. there are plenty of threads on that subject around here, so i'll let y'all search for that when you're ready to take a look at it.
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Mountain Pass
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Drew
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From: Morgantown, WV
I haven't really looked into it yet but how much is a pyrometer and where can I find a decent one but not spend a fortune?
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Post Fiend
Joined: Feb 2009
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From: Ottawa, Ontario
You'll be looking for this little triangle cap, on the passenger side of the pump.
As said above, allen wrench (7/16 I think it is), and towards cab is fuel decrease, towards Rad, increase.
You'll want a small rag put under the pump before you take that cap off, as abit of diesel fuel will run out the pump. It may take abit of cranking up again before engine fires up as the pump will loose abit of prime.
As said above, allen wrench (7/16 I think it is), and towards cab is fuel decrease, towards Rad, increase.
You'll want a small rag put under the pump before you take that cap off, as abit of diesel fuel will run out the pump. It may take abit of cranking up again before engine fires up as the pump will loose abit of prime.
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joey, grey smoke out one side tells me that it probably has at least one worn out injector on that side, which is producing such a poor spray of fuel that in only partially burns.
getting a little bit of black is normal when you really put your foot down. but a good driver watches his mirror and pulls his foot back just enough to minimize black smoke.
More Turbo
Joined: Nov 2010
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From: Cincinnati, OH
I think I would get the timing set correct value first, then you can adjust the fuel to meet your expectations. Incorrect timing affects all the rest: power, economy, driveability are all affected by timing. Once you have that set right, then you can adjust the fuel screw, new injectors, or other changes.
Agree 100% that pouring black smoke out the tailpipe does nothing except make you look bad. It is not more power, but a little black is acceptable at full throttle. Grey is incomplete combustion and typical to get a little bit when cold. Most of the time at part throttle and cruising you should not see any smoke at all.
Agree 100% that pouring black smoke out the tailpipe does nothing except make you look bad. It is not more power, but a little black is acceptable at full throttle. Grey is incomplete combustion and typical to get a little bit when cold. Most of the time at part throttle and cruising you should not see any smoke at all.
Fleet Owner
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From: Mi'kma'ki
black smoke seen in the rear view mirrors = incorrect tune under any condition.
if you need to monitor your driving style to simulate an engine being in proper tune,then your engine isn't in proper tune.
it's important to adjust the timing after setting the fuel screw because adjusting that screw alters timing.
couple penny's worth.
if you need to monitor your driving style to simulate an engine being in proper tune,then your engine isn't in proper tune.
it's important to adjust the timing after setting the fuel screw because adjusting that screw alters timing.
couple penny's worth.
Junior User
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great pic IDIDieselJohn but allen in pump i believe is 5/32 tho. i had this same exact problem when i got my truck and i have turned it way down since but something is still off. would love to find someone around here who knows what their doing to time mine properly every shop ive called does it by ear and the one who had a clue had a broken ferret meter, go figure!
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