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No acceleration

Tiny
GPASS
  • MEMBER
  • 1987 TOYOTA PICKUP
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 455,000 MILES
I have the truck listed above, 22R, 2bbl, four speed. Original owner. Over the last 150,000 or so miles it has had a few issues that I promptly repaired. The usual maintenance stuff: alternator, water pump etc. Then I replaced the head about 75,000 miles ago. No problems it ran great until a few weeks ago.
Starts and idles fine, revs fine all is normal except when I put it in gear and head out there is no acceleration ! It just goes flat.
I have done the following:
New fuel filter.
New fuel pump.
New air filter.
New distributor and vacuum advance.
Set timing.
New BVSV (I broke the tip off so I replaced it).
Replaced vacuum lines with new hose.
New rebuilt carb, bench tested and dialed in.
Adjusted valves.
Compression front cylinder to rear 180, 185, 190, 180.
Still starts and idles great until you drive it, step on the gas and it just goes flat with no acceleration at all.
Does anyone have any thoughts on this?
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Saturday, March 31st, 2018 AT 1:54 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It would be a good idea to have the back-pressure in the exhaust tested to check for a plugged catalytic converter. It should have no more than 1 PSI measured in front of the catalytic converter.
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Saturday, March 31st, 2018 AT 3:29 PM
Tiny
GPASS
  • MEMBER
  • 2 POSTS
Thanks. I finally got some time to check it out and that seems to be ok. I may try another vacuum advance. Perhaps the one that I purchased is defective. NAPA said they would swap me out.
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Monday, April 9th, 2018 AT 1:10 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,476 POSTS
Will it slowly accelerate if you slowly give it throttle or nothing? Have you checked to be sure it isn't something like a jammed brake or similar? Might be a good idea to verify it will roll freely in neutral.
You can test the advance with a timing light, plus you say it revs OK out of gear.
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Wednesday, April 11th, 2018 AT 3:02 PM

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