92 Previa Won't Acelerate past 40mph seems like not getting fuel

10

Asked by Mar 23, 2016 at 02:27 AM about the 1992 Toyota Previa 3 Dr Deluxe Passenger Van

Question type: Maintenance & Repair

changed plugs no difference

15 Answers

76,365

May be a plugged catalytic converter, have an exhaust shop check it out.

Change the plug wires!

10

We changed plug wires ...did not help.....

76,365

I'm sticking with the cat. just go to an exhaust shop and have it checked out.

10

will check it out thank you

10

OK sat over winter ..started last week sputtered and backfired and blew out flex pipe and ran good but loud so we thought you were right must be plugged cat. Took out today and barely could get to gas station ...put fresh gas in still ran badly. smelled strong raw gasoline. push slowly (in neutral) on gas it would rev up ...push hard on gas sputters like crazy almost like it is chocking itself out...

76,365

Number of things but sounds like a fuel issue. Throttle Positioning Sensor should be checked out along with the fuel pressure. What size is this engine so I could tell you what the fuel pressure should be.

1 of 1 people found this helpful.
10

more info ...on way to gas station ...had to keep putting in nuetral to get engine revving ..at times engine knocked like crazy as if timing was severely retarded took it out on high way for a bit and came back running better but still missing....

10

4 CYLLINDER 2.8 LITER?

1 of 1 people found this helpful.
76,365

Fuel pressure should be around 30 to 37 lbs.

10

How do I check it ....what do I do if it is not 37 lbs

76,365

You can rent a fuel pressure gauge from the parts store, but you need to have all the right fittings to tap into the fuel line up on the intake manifold. Then start it up and let it idle to see what the pressure is. When you shut it down, let it sit for 5 minutes to see if the fuel pressure drops more than 5 lbs. If it does then there are leaky fuel injectors,

1 of 1 people found this helpful.
10

COULD IT BE FUEL PUMP?

10

I PUT OCTANE BOOST IN SEEMED TO HELP A BIT....

76,365

Diagnostic of a problem is a process of elimination. Not gonna keep guessing until we have some known facts.

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