Bucking at Low Speed, poor acceleration - Toyota Nation Forum : Toyota Car and Truck Forums


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Old 07-15-2010, 03:03 PM   #1 (permalink)
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Bucking at Low Speed, poor acceleration

Hello, I have a 1993 Toyota Pickup 4x4 MT 3.0 V6 extended cab. Sometimes when I start down the road when the engine is cold, it wants to buck for about 5 to 10 seconds. It will eventually smooth out. Also I've noticed that when the engine reaches 2500 RPMs it starts to pull really well. It's not a gradual thing, but almost feels like a flooded cylinder kicking in. This only happens on occasion.

Here is what I've done so far:

Replaced Vane Air Flow Meter
Cleaned Throttle body
Inspected and adjusted TPS
checked timing (within spec)
Replaced clutch, pressure plate, pilot bearing, and throw out bearing, and rear main seal
new plugs, wires, distributor and rotor button
replaced PCV valve
new coil
new battery
replaced intake plenum gasket and tested injectors with ohm meter
Replaced fuel filter
Seafoamed engine and fuel system
Tested fuel pressure at the cold star injector (40psi at idle)
Tested engine coolant temp sensor (within spec)
Tested 02 sensor (within spec although I did have a code 21 once but it's never came back on)


I've tried my best to figure this problem out but nothing seems to fix it. Any ideas are good ideas.

Thanks in advance.

Kevin

Last edited by KevinCro; 07-15-2010 at 03:05 PM.
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Old 11-18-2013, 10:17 PM   #2 (permalink)
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I get this same behavior until my truck warms up to operating temp...
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Old 11-19-2013, 06:45 AM   #3 (permalink)
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Could be a leaking injector or CSI causing a flooded cylinder...

Not sure. I'm not as familiar with the foibles of the 3wheezy
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