tach problem
Thread Starter
Heel & Toe
Joined: Apr 2004
Posts: 23
Likes: 0
From: Merrimack NH
tach problem
before I bought the car a motor was put in and I put a snap-on scan tool on it and it said it was idleing at about 800 when the tach read 1500. and when i brought it up to 6000 on the tach the scan tool only said 3000. I was wondering if anyone had the same problem, I dont know if it is in a cam or crank sensor or if there are either of those. i asked a service person at gm and he said it could be the whole cluster but i dont buy it, he didnt seem like he knew what he was talking about.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Re: tach problem (Pete9473)
Helps to post the year-but according to Gordon Killebrew at least 84-89 most tach problems were related to water in the main bulkhead connection-engine compartment. His recommendation unplug the connector an blow it out with air-the black grease in there is for anti corrosion and water gets trapped in the pockets. If you do check it-the connection should be sealed after plugging back in. :steering: or it might be the tach filter.
[Modified by rick lambert, 8:23 PM 4/14/2004]
[Modified by rick lambert, 8:23 PM 4/14/2004]
