Question about 1988 GMC S-15

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Truck misfires at steady rpm

Hold truck at any rpm in any gear and it misfires

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You have a valve prob! Could be rather costly! Frankster016

Posted on Dec 07, 2008

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Posted on Jan 02, 2017

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Whats a p0700.....


P0700 Fault Code Definition
  • Transmission Control System Malfunction
What does this mean?
The purpose of the automatic transmission is to match the engine's optimum power and torque characteristics to the driver's desired rate of acceleration and speed by auto-selecting different gear ratios or 'speeds' to power the wheels.
When the code P0700 is set in the Powertrain Computer, it means that the Powertrain Computer or PCM is seeing greater than a specified RPM difference between the rotational speed of the Input RPM Sensor and the Transmission Output RPM Sensor. This can occur during shifting or when driving at steady speeds in the same gear. It often implies that the transmission is slipping.
Symptoms
  • Check Engine Light will illuminate
  • Vehicle will not shift properly
  • Decrease in fuel economy
  • In unusual cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be performance problems, such as dying when coming to a stop after driving on the freeway and/or misfire-like symptoms
Common Problems That Trigger the P0700 Code
  • Defective Shift Solenoids
  • Defective Engine Coolant Temperature Sensor
  • Defective Valve Body
  • Dirty transmission fluid that restricts the hydraulic passages
Common Misdiagnoses
  • Engine Misfire problem
  • Internal Transmission problem
  • Driveline problem

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please explain the full story.
i have 5speed transmission option
and in 5th gear it does something odd.
what?
1: im going on flat ground, up hill , down hill?
2: im accelerating , deceleration or holding steady speed.?
and what does it do , go to neutral and RPM goes why high?

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Are you sure you mean passing gear ?
Or when it shifts into overdrive ?
Passing gear would be when it downshifts from 3rd into second gear.
If the car is OBD2 the check engine light should be on if the miss is steady. If the light is on you can have the computer scanned to find out which cylinder is failing.

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Truck misfires at a steady rpm


how many miles does the truck have? It sounds like the timing chain has slack in it, making the timing get off???

Nov 27, 2008 | 1988 GMC S-15

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