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Old 01-13-2019, 02:52 PM   #1
Dav
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1988 2.9 auto long bed
towed a trailer for the first time with this truck. trailer and cargo weighed about 2000 lbs.
after 30 miles, the truck started surging from 2700 rpm to 2400 and 5 or 10 seconds later going back up. at first i thought it was trying to shift but it was at near steady speed on flat ground.
any time i slowed down, the fumes would catch up, really nasty fumes. at stops, the engine would idle fine but as i accelerated it would do a few farts and keep going. at one point it started smoking like a major oil leak but there wasn't one.
30 miles later the trailer was unhitched and left. the truck ran fine all the way back.
anyone have any idea what the problem might be?
i have to tow the trailer back next weekend
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Old 01-13-2019, 04:57 PM   #2
RonD
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Check the modulator vacuum hose on transmission end, make sure there is no trans fluid in it
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Old 01-14-2019, 10:18 PM   #3
Dav
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I use this vehicle for: work, play
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well, took a while but i found a line from the intake to the back end of the trans. i'm not as limber as i used to be so crawling under stuff is difficult. could not get the line loose to check it
what would cause atf to get into this line? and will it drain back out on it's own?
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Old 01-14-2019, 11:07 PM   #4
RonD
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If the diaphragm fails inside the modulator then ATF will go into Vacuum hose and some will be sucked into engine causing surging and smoke as it is burned

I am just guessing as to the cause of your symptoms.
When pulling a load engine runs with higher vacuum at speed.
You can check the engine end of the hose for signs of ATF, its a vacuum hose so will only have seen air all its life, should be no signs of any kind of oil.

Transmission should shift oddly as well which you don't mention

Last edited by RonD; 01-14-2019 at 11:10 PM.
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