mysterious rpm's - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 2 (permalink) Old Aug 10th, 02, 10:40 AM Thread Starter
Join Date: May 2002
Location: punta gorda fl usa
Posts: 11
89 350 firebird automatic .ever since i bought this car i have had this condition. from time to time, especially in the morning at highway speeds, the rpm's will fluctuate between 1700 and 2000 rpm's . it only seems to do it when on the highway at higher speeds(70-75) any ideas what is causing this, and how to fix (other than a engine swap). thanks ahead of time.

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post #2 of 2 (permalink) Old Aug 10th, 02, 05:11 PM
Senior Tech
Join Date: Jan 2001
Location: conway s.c.
Posts: 168
Hey tazjet1701,
Just can't seem to stay away from your buddies here can you? It sounds like you might have a small vaccum leak that only shows up when you are traveling at higher speeds.Check the torgue on all your bolts and check all your vaccum lines possible cuts and dry rot. As far as your fuel guage in your other post, maybe it still has some of that 13 years worth of crud in it that you missed when you cleaned behind the dash.
Actually, the connector for your fuel pump is located behind the rear seats. Pull them and trace the wiring from there down the left side of the car underneath the door threshhold pane; to the firewall. Another thought is when you replaced the pump, did you replace the sock on the pump and was it properly installed(not interfering with the movement of the float)?

Good luck!!!!!!!!!!!!!

The Trickster!!!!!!!!!!!!!!!!!!!!!!!!!!!
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