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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6ya6ya
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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

Jan 02, 2016 | Cars & Trucks

1 Answer

Why does my Nissan almera misfires when I am accelerating


Is the check engine light flashing or on steady if so recommend getting the codes checked first. Possibly bad coil or plugs

Sep 21, 2014 | Cars & Trucks

1 Answer

2000 suzuki steem 5 gear jump ?


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?

Define JUMP>

May 05, 2014 | 2000 Suzuki Esteem

1 Answer

Engine misfires at high rpm no code


Bad ignition coils will make the truck act like this. Also low fuel pressure.

Apr 02, 2014 | Ford Ranger Cars & Trucks

1 Answer

Car misfires in passing gear


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.

Apr 04, 2013 | 1996 Buick Park Avenue

1 Answer

Misfire on a 1993 suburban 5.7 ltr.


how to unistall alrm from chevy blazer 97

Feb 23, 2013 | 1993 Chevrolet Suburban

1 Answer

What does obd code p0301 on 2002 pt cruiser mean?


Trouble Code: P0301

Cylinder No. 1, 2, 3 or 4 Misfire Detected

Trouble Code Conditions: Engine is running; atmospheric pressure, fuel level, battery voltage, engine speed, engine load are above minimal predetermined specifications; the engine is not in fuel cutoff and intake air temperature and coolant temperature are within normal operating ranges; there are no DTCs relating to ECT, CMP, CKP, MAP or IAT Sensor, to Crank rationality, to Crank Sensor Learn invalid, or to System Voltage. If total misfires detected are greater than 7% during the first 1000 rpm, or are over 3% after the first 1000 rpm, or are 25% during any 200 rpm with suspect cylinder misfire counter more than 80% and no other cylinder misfire counters above 80%, this DTC will set. The MIL will flash after first trip occurrence and will be steady after second trip.

Possible Causes:


Fuel system problems existErratic CMP or CKP Sensor signalsIgnition system problems existEngine mechanical problems existPCM has failed

Jan 29, 2013 | 2002 Chrysler PT Cruiser

1 Answer

99 neon misfire error code 43....how to fix


43 ignition control circuit not responding

Possible bad igntion control module (built into in PCM)

Oct 31, 2012 | Cars & Trucks

3 Answers

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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