I have a flat spot on first rev up

Tiny
DTLM0
  • MEMBER
  • 1979 TOYOTA
  • 79,000 MILES
There is a flat spot at the beging of trottle it ticks over ok and you can rev engine up ok the timings been done its had new points plugs and leads
Thursday, February 23rd, 2012 AT 10:20 PM

3 Replies

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
You should check the fuel pressure.
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Friday, February 24th, 2012 AT 1:57 PM
Tiny
DTLM0
  • MEMBER
  • 10 POSTS
Thanks for your reply how do I check fuel pressure thanks
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Friday, February 24th, 2012 AT 10:21 PM
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
First get a fuel test pressure kit. Advance Auto and Auto Zone have these on a loaner basis. There is a test port on the fuel rail and the kit will have adapters. Either let the car sit overnight or realize that fuel at ove 50 PSI is waiting for you to let it loose if you loosen a bolt or anything on the fuel system without waiting.
I do not have the pressure specs for your car as my manual does not go back that far. If it is carberated, it should be around 7 PSI or so and fuel inject would be around 25+ PSI. That is a guesstimate thoguh so when you gpo to the auto store have them try to look up the spec or get a Haynes manual. The Hayens will be helpful as it will walk you through the test.
Hook up the gauge and then start the car. Remove vacuum or other connector on fuel reulator to see if pressure goes up. If it does that is good.
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Saturday, February 25th, 2012 AT 1:46 AM

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