Question about 1991 GMC Sonoma

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Flashes codes 12 and 32 intermittently after running rough

What do the codes mean? Is one the egr valve?

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The 12 code is the start for the codes to be read code 32 is a map sensor code but does not mean that , i have a 91 sonoma and same codes turns out it wes my intake gaskets

Posted on Sep 14, 2008

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Running fine then rough run engine. flashing check engine light


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Where is the egr valve on a 99 Ford expedition


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Rough idle problem


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Idle is rough


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Have a code 71 derm modlue fault what to do


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P400 code on a 2000 mitsubishi diamante


P0400 - Exhaust Gas Recirculation Flow Malfunction
The exhaust gas recirculation (EGR) valve is vacuum controlled valve that regulates the amount of exhaust gases that re-enter the cylinders. The powertrain control module (PCM) determines how much based on engine load, temp, and other conditions. If the PCM detects that the amount of exhaust gases entering the cylinder were insufficient or non-existent, this code is set.

Symptoms: No symptoms will likely be noticed by the driver other than the MIL (malfunction indicator lamp). However, non visible symptoms will be increased combustion temperature and increased Nox emissions.

Causes: A code P0400 may mean that one or more of the following has happened:
Plugged EGR passage which restricts the flow of exhaust gasses
Faulty EGR solenoid
Faulty EGR solenoid wiring/harness
Vacuum lines damaged/disconnected to the EGR valve solenoid or to the EGR valve
Faulty EGR valve

Possible Solutions: Since EGR valve designs are different, no one test will suffice:
Using a scan tool, operate the EGR valve with the engine running. If the engine stumbles, the problem was likely intermittent wiring problem or intermittent blockage problem
If engine doesn't stumble, operate the EGR valve manually, if possible. If engine doesn't stumble and die, the ports are likely plugged. Removal of valve and cleaning of all ports will be required
Checking of solenoid can only usually be done with a scan tool, because most solenoids operate with a duty cycle of voltage, rather than constant voltage
Check all vacuum lines, hoses, etc for any damage
Visually inspect the solenoid harness and the solenoid for damage
Replace EGR valve

Hope this helps.

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When the accelerator pedal is depressed, it can change things so that the engine seems to run smoothly.

However, I would look for codes to see if anything intermittent is occurring in the engine that may need attention.

The OBD-I scanner can help to diagnose the problem, if anything is out of specifications on the engine in question.

The owner will have to find a technician that has such a scanner.

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Took it to mechanic after it wont stay running he said it needs a crank shaft position sensor and egr valve. Where is the sensor and how do you replace it and how do you replace the egr valve.The mechanic...


what are the codes that made him think these two parts need replacing. The egr could cause a rough idle or stall, But it would need to be stuck open a little which may not set an egr code.

The crank sensor wouldnt cause a rough idle but the car could stall at times intermittantly.

What are you exact symptoms

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RUN RUFF NOW KNOCKS


Sounds like he hydrolocked it and bent a connecting rod.

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