1993 Toyota p/u with no power.

Tiny
RIKMICHAELS
  • MEMBER
  • 1993 TOYOTA PICKUP
  • 4 CYL
  • 2WD
  • MANUAL
  • 180,000 MILES
I have absolutey no pwer in my truck. It seems to rev fine when idling but slow to get up to speed. I took the spakplug wires off to see if they were firing and I have good fire on one and four, but not much with 2 and 3. What could be the problem?
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Sunday, March 27th, 2011 AT 7:03 PM

7 Replies

Tiny
KHLOW2008
  • EXPERT
Have the compression checked. You could have low compression on both to cause the poor performance. Do you have overheating and/or coolant losses issues?
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Sunday, March 27th, 2011 AT 7:18 PM
Tiny
RIKMICHAELS
  • MEMBER
No it is not overheating at all. Iwas fine then about 3 hours later(after sitting) it just starts this!
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Sunday, March 27th, 2011 AT 9:55 PM
Tiny
KHLOW2008
  • EXPERT
Apart from the compression, other possible causes are stuck fuel injectors, bad spark plugs or related components.
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Monday, March 28th, 2011 AT 1:22 PM
Tiny
RIKMICHAELS
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Is there a wya a layman like myself could check the fuel injectors? I did change the spark plugs because they were fouled. It did not improve anything. I will be checking compression today.
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Monday, March 28th, 2011 AT 2:35 PM
Tiny
KHLOW2008
  • EXPERT
It is possible but before removing the injectors, ensure there is battery voltage at one of the wires when ignition is turned on. You can try listening to the injectors to check if they are clicking when engine is running. If no clicking and battery voltage is available, you would need a noid light to test if the injectors are pulsing. To check if the injectors are stuck in open position, you would need to remove them and while attached to the fuel rail ( ensure they are tightened as fuel pressure can force them out of their seats) and turn ignition on. If any are leaking, fuel would be flowing from the injectors.
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Monday, March 28th, 2011 AT 2:48 PM
Tiny
RIKMICHAELS
  • MEMBER
From one through four I have, 70, 70, 70, 47 psi. The specs I found are for 9.3 to 1. I have know I dea how the math works but I am assuming that it is compression.
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Monday, March 28th, 2011 AT 3:59 PM
Tiny
KHLOW2008
  • EXPERT
Chart shows the compression specifications. The specs you have is the compression ratio. What is important is the psi. They are all way below minimum with #4 having extremely low compression. Most likely the valves are leaking. Have the valve clearances checked and try a wet test, by pumping some engine oil into the cylinders via the spark plug holes and cranking the engine without the spark plugs. Retest the compression and see if they increases.
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Monday, March 28th, 2011 AT 8:35 PM

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