Stalling during slowdown after new injectors installed
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Fleet Mechanic
Joined: Sep 2005
Posts: 1,509
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From: Ladner, British Columbia
Stalling during slowdown after new injectors installed
I recently installed a new IP on my 91' F350 7.3l N/A E4OD and kept the old injectors. Everthing ran fine for several month.
Decided to replace the injectors as well about a week ago. Replaced them just for the hell of it as they were the original 1991 injectors. Ever since the injectors were replaced the engine now "occasionally" stalls when I come of the throttle hard. It immediately re-starts and and don't think there are any air intrusion issues. All the return lines, orings, etc. are new.
All the old injector came out fine c/w washers, all were in good shape. All the new injectors were properly torqued with new washers.
Why would the engine start stalling all of a sudden on rapid throttle return, considering it did not do this with the new IP and old injectors?
Seb.....
Decided to replace the injectors as well about a week ago. Replaced them just for the hell of it as they were the original 1991 injectors. Ever since the injectors were replaced the engine now "occasionally" stalls when I come of the throttle hard. It immediately re-starts and and don't think there are any air intrusion issues. All the return lines, orings, etc. are new.
All the old injector came out fine c/w washers, all were in good shape. All the new injectors were properly torqued with new washers.
Why would the engine start stalling all of a sudden on rapid throttle return, considering it did not do this with the new IP and old injectors?
Seb.....
Senior User
Joined: Dec 2006
Posts: 344
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From: Byron New York
How old is the fuel filter? Almost sounds like it is running maybe in a slight vacuum. When you come off hard on the throttle there is not enough fuel in place to keep it running. By the time you go to restart some pressure has been restored from coasting. Just a guess.
Elder User
Joined: Sep 2006
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Hows does the truck run with the new injectors? Any better, same.....it might be the IP....older injectors took less to operate?? Then again, "new" doesn't always mean good.
I still have lots of white smoke at start up & think it may be 1 of the 2 "new" injectors, I replaced 2 years ago?!!
I still have lots of white smoke at start up & think it may be 1 of the 2 "new" injectors, I replaced 2 years ago?!!
Posting Guru
Joined: Oct 2005
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From: Powell River B.C.
New Injectors may have the pop pessures at the high end. Did you have them tested before install. I know that the E codes on my 93 pop new is 1950-2050 as compaired to earlier one at 1800.
New User
Joined: Mar 2006
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Hey I was going to post the exact same thing. I replaced my injectors, return lines, and GP's. When I took it out for a couple of test runs mine stalled when aproaching the stop signs when I was letting up off the gas.
Mine also is harder to start, having to crank much longer and let the starter cool and crank again when cold and sat for the day. When warm starts right up. Are you having the hard cold starting problem also Hamberger?
Only thing I did not do is change the IP.
My engine still run the same rough with smoke and I do have blowby with a little pressure when I put my hand on the oil fill hole.
I will keep an eye on this thread because I thing the drivers around here is angry enough by a good wiff of my smoke.
Mine also is harder to start, having to crank much longer and let the starter cool and crank again when cold and sat for the day. When warm starts right up. Are you having the hard cold starting problem also Hamberger?
Only thing I did not do is change the IP.
My engine still run the same rough with smoke and I do have blowby with a little pressure when I put my hand on the oil fill hole.
I will keep an eye on this thread because I thing the drivers around here is angry enough by a good wiff of my smoke.
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Fleet Mechanic
Joined: Sep 2005
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From: Ladner, British Columbia
[QUOTE=Winger235]How old is the fuel filter?
I have been struggling getting my tanks cleaned up after some bad biodiesel. I just changed the fuel filter about a month ago but my guess would be it is probably due again. I just have not bothered with it as the Fuel Filter light had not started to come on yet like it has been doing.
Sebastian.
I have been struggling getting my tanks cleaned up after some bad biodiesel. I just changed the fuel filter about a month ago but my guess would be it is probably due again. I just have not bothered with it as the Fuel Filter light had not started to come on yet like it has been doing.
Sebastian.
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Post Fiend
Joined: Nov 2004
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From: Manitoba
When you replaced the IP if you did not have it timed it could be way off. The injector change has probably changed the timing even more.......
Any injector change will also change the timing........ weak injectors fire early, up to par fire when they are supposed too.......
Any injector change will also change the timing........ weak injectors fire early, up to par fire when they are supposed too.......
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Fleet Mechanic
Joined: Sep 2005
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From: Ladner, British Columbia
Originally Posted by PLC7.3
When you replaced the IP if you did not have it timed it could be way off. The injector change has probably changed the timing even more.......
Any injector change will also change the timing........ weak injectors fire early, up to par fire when they are supposed too.......
Any injector change will also change the timing........ weak injectors fire early, up to par fire when they are supposed too.......
You could be right that the old injectors fired early and when I installed the new injectors with the higher firing pressure I now have problems.
I will follow up on changing the filter first as I would not be suprised if it is already plugging on me again.
If that does not do it I might cut back on the timing more toward factory specs and see whether that will help.
Seb....
Lead Driver
Joined: Jan 2005
Posts: 7,782
Likes: 221
From: Huntington Indiana
Hamberger - What % of bio was you running? At 5-20% you shouldn't need to change any settings.
Also have you checked the frame fuel lines for corrosion? I found a air leak there in the steel lines.
Also have you checked the frame fuel lines for corrosion? I found a air leak there in the steel lines.
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Fleet Mechanic
Joined: Sep 2005
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From: Ladner, British Columbia
Stalling
Originally Posted by bigredtruckmi
Hamberger - What % of bio was you running? At 5-20% you shouldn't need to change any settings.
Also have you checked the frame fuel lines for corrosion? I found a air leak there in the steel lines.
Also have you checked the frame fuel lines for corrosion? I found a air leak there in the steel lines.
Fuel lines are fine, the problem started right after I put the new injectors in.
I am confident it is not a air problem as the truck cold starts fine and it fires right up after it stalls, i.e. no cranking required to get air out after it stalls.
I froze up one tank of B40 late last year and that is still giving me trouble. There is some residue left in the tank that formed after the B40 thawed that is still plugging up my filter when I use that tank. It is a waxy margerine like substance that just blinds over the 2 micron Racor paper filter. I have gone thru about three filters in the last two month and my guess it that these latest problems are due to a filter that is almost, but not quite plugged again. I am hoping the fact that I just put in new injectors is just coincidental.
I will see what comes out of this after I change the filter this weekend.
I can't see how the new injectors could cause the truck to stall .
Seb....
Elder User
Joined: Apr 2006
Posts: 894
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From: South Dakota
Originally Posted by Hamberger
The pump was timed and advanced 1.5 degrees which improves running on biodiesel. At first I ran the new pump with the old injectors and they worked fine together. The problem only started when I installed the new injectors.
You could be right that the old injectors fired early and when I installed the new injectors with the higher firing pressure I now have problems.
I will follow up on changing the filter first as I would not be suprised if it is already plugging on me again.
If that does not do it I might cut back on the timing more toward factory specs and see whether that will help.
Seb....
You could be right that the old injectors fired early and when I installed the new injectors with the higher firing pressure I now have problems.
I will follow up on changing the filter first as I would not be suprised if it is already plugging on me again.
If that does not do it I might cut back on the timing more toward factory specs and see whether that will help.
Seb....
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Fleet Mechanic
Joined: Sep 2005
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From: Ladner, British Columbia
Originally Posted by Dave7.3
Do you think making an adjustment like that would help with your stalling problem as well?
The pump is a new pump I installed in Dec. 06. J just added the new injectors in Feb. 07.
The truck ran fine with the new pump and old injectors but is starting to stall on rapid throttle release once I installed the new injectors in Feb. 07.
The pump itself was timed 1.5 deg. ahead, something I had done to improve running with Biodiesel. My timing marks currently line up perfectly. I could retard the the pump to see if this will solve the problem. I might try that if the filter change does not solve my problems.
Seb...
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