1991 cluster trouble
Le Mans Master
Joined: Jan 2010
Posts: 8,553
Likes: 3
Yep...my '91 vert does the same stuff. My tach will read 1500 rpms, when scanner shows 750 rpms, but the tach will rev in accordance with engine. My water and oil temps seem low too..hovers just over the 100 starting point.
I was told about possible loose connection too...I'm interested in the resistor fix.
Edit...Anyone out in the NW Indiana area who wants to help me replace/do this fix?
I'm just a little nervous doing this myself.
I was told about possible loose connection too...I'm interested in the resistor fix.
Edit...Anyone out in the NW Indiana area who wants to help me replace/do this fix?
I'm just a little nervous doing this myself.
Last edited by Jamesnns; Mar 2, 2010 at 01:15 PM.
Thread Starter
Racer
Joined: Sep 2008
Posts: 461
Likes: 11
From: baton rouge louisiana
yes,,thats exactly what mine is doing,i replaced the water temp sender switch for nothing,it still reads too cold when its hot,,do we think all this trouble could be the filter on top the engine?and not the cluster???????????
Racer
Joined: Dec 2003
Posts: 349
Likes: 0
From: Hong Kong
Ive done some extensive searching on the forum, seems a lot of the 90-91 cars have faulty clusters or clusters that dont last long. people have replaced the tach filter on these cars and the problem still exists... from what I gather its quite difficult to replace the tach filter too.
seems the tach filter helps more so on 89 and earlier cars.
90 and up use different tach filters to 89 and earlier cars i believe
Another way to test the water temp and oil temp is to disconnect the sensors and jumper the two wires together and the guages should read to the full value. My water temp did, but my oil only moved a tiny bit, so seems like the resistor inside the cluster.
seems the tach filter helps more so on 89 and earlier cars.
90 and up use different tach filters to 89 and earlier cars i believe
Another way to test the water temp and oil temp is to disconnect the sensors and jumper the two wires together and the guages should read to the full value. My water temp did, but my oil only moved a tiny bit, so seems like the resistor inside the cluster.
Thread Starter
Racer
Joined: Sep 2008
Posts: 461
Likes: 11
From: baton rouge louisiana
i grounded the wire on the temp sensor and it pegged the meter in the cluster,,so clusters ok on that,,i noticed ,,,with no key in the neddle on the tack sits below o when i insert the key and turn it to accessory its on o but when i start it its on almost 3000 rpm on idle ,,,
Thread Starter
Racer
Joined: Sep 2008
Posts: 461
Likes: 11
From: baton rouge louisiana
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Thread Starter
Racer
Joined: Sep 2008
Posts: 461
Likes: 11
From: baton rouge louisiana
fix
i fixed my faded read out ,it was the connection ...must have been loose,,,i changed the tack coil but still have the same trouble,the coil inside the cluster i mean,,maybe i need to change the coil on top the engine,,what do you think?
Racer
Joined: Apr 2010
Posts: 409
Likes: 1
From: New York
Ah so this is my problem I think. My rpms seem to read high 1200 and then move down to 900 closed loop yet it appears to be idling quite fine. I wish I could use my ob2 scanner on this is there a way for me to adapt my ob2 scanner to this car. What test can I run to check my rpms on the tach. Everything else seems to be ok hmm
