This is killing me! when I have been driving constant for about 20 min. or more, my car will suddenly start hesitating; kinda like its missing. It only does it at about half throttle. From 3/4 to full throttle, it clears up and runs a little smoother. After the first hesitation, the SES light comes on.
It will hesitate every time I press the gas. Here's something else--my temp gauge usually doesn't work. When the car starts acting up,I can stop and turn off the car, wait about 30 sec, and then restart it, and the light goes off. But here's the kicker, my temp gauge starts working. This is the only time it works! I scaned the trouble codes and came up with a 33-- MAF sensor. If anyone out there can help quickly, I would greatly appreciate it! Sorry this was so long too!

 

try swapping in a known working MAF sensor if you can find one. that should clear up your problems. if not, try replacing the MAF and burnoff relays on the firewall by the master cylinder. if you buy a new MAF sensor, always make sure and replace the MAF and burnoff relays at the same time.

[This message has been edited by u r sofa king we tah did (edited October 30, 2001).]

 

THanks, I'll try that tomorrow. SO if I put a good used MAF in the car, I shouldn't have to worry about changing those relays?

 

Ate,

Before you try a different MAF sensor, check the electrical connectors on the MAF and both relays. Since the relays are the same, you can exchange the MAF power and MAF burnoff control relays to see if that solves the problem.

A DTC 33 means the MAF has detected an intake air flow greater than what is expected at a given engine RPM and throttle position. This can mean that the MAF is not sensing correctly, or that the TPS sensor is improperly adjusted or failing.

A TPS voltage that is too low can set this code, since the ECM is being told that the throttle is open less than it actually is. A poor connection at the TPS can also cause a lower signal, translating to a lower throttle opening reading. A failing TPS can have a higher resistance and lower voltage than it should at a given throttle position.

A modified MAF sensor can also set this code, especially if the screens are removed and the MAF is oriented in a way that forces too much air to flow through the sampling tube in the center of the MAF. A failing MAF can also report higher than actual flow, or a poorly grounded MAF can cause a high flow signal.

If the relays and connectors do not solve your problems, make sure you check the TPS voltage adjustment. At the proper minimum air positon setting of the throttle, the voltage should be no lower than 0.47 VDC, and ideally should be 0.54VDC. If the throttle position was inadvertently adjusted in an attempt to change the idle speed of the engine, you'll have to start from scratch and reset the minimum air position before any other adjustments and readings are undertaken.

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Later,
Vader
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[This message has been edited by Vader (edited October 30, 2001).]