1997 Chevy Truck

TEXASNASCARFAN200

MEMBER
1997 CHEVROLET TRUCK
V8
2WD
AUTOMATIC
92,000 MILES

A while back I parked the pickup and when I went to start it it was hard to start I finally got it started but since then it starts good but if you step into the gas hard it misses but then it will clear up sometimes when your going down the road say at 70 and you let off and get back into to it slowly it will miss I had a scan ran on it and they said it was my MAF sensor im thinking it could be a throttle position sensor any help would be greatly appreciated

3 Replies

PEAR69

MECHANIC
1,482 POSTS

Test the TPS sensor. A TPS sensor is a potentialometer that changes voltage output according to throttle position. This tells the computer the exact throttle position.
If a scan tool said the MAF sensor is bad try cleaning it out by removing it and spraying some brake cleaner through it. Do not brush or wipe it in any way. If this fails replace it.

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Monday, May 19th, 2008 AT 5:28 AM

TEXASNASCARFAN200

MEMBER
2 POSTS

How do you test a tps on a 1997 chevy pickup

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Monday, May 19th, 2008 AT 7:34 AM

PEAR69

MECHANIC
1,482 POSTS

First you need a voltage meter set to DC volts.
There are three wires on the TPS. One is the ground (black) one is the 12 or 5 volt (gray or pink) and one is the signal wire (dark blue). Now, turn the key on but do not start the engine -- back probe the dark blue wire with the positive probe and connect the negitive up to a good engine ground -- open the TB and observe the meter. The voltage should go up and down ( according to throttle position) SMOOTHLY -- with no "hiccups". If the voltage hiccups or is going crazy -- the TPS is bad.

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Tuesday, May 20th, 2008 AT 6:24 AM