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RPM & Oil Pressure sensor
Have two issues: 1- got me a new oil pressure sensor and switch (old one leaking) both come on the Tee in the back of the engine below the dist. Does the FSM show how to connect which wires? Which section in the manual? I couldn’t find it. 2- RPM doesn’t move at all (photo attached) stays there all the time on or off. What could be the problem and how to solve it? https://cimg0.ibsrv.net/gimg/www.cor...8fc3c8b0c.jpeg Thanks |
Forgot to mention the ride is 1991 L98 auto (stock. |
Tach should park @ 0 when ignition is 'KEYED ON' - 'NOT RUNNING'. If the Tach isn't properly calibrated then it could/can wander but not usually as you've pictured. That snapshot looks to have been done with key in your pocket. Tach wire disconnected @ the distributor would be the first check. Are you familiar with the 'WHITE' wire @ the HEI distributor? If the WHITE is connected correctly @ the HEI then a 'busted' wire in the circuit somewhere. Tach filter if stock would be bolted to the rear of the LH cylinder head. Check it for connections.
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Originally Posted by WVZR-1
(Post 1598145787)
Tach should park @ 0 when ignition is 'KEYED ON' - 'NOT RUNNING'. If the Tach isn't properly calibrated then it could/can wander but not usually as you've pictured. That snapshot looks to have been done with key in your pocket. Tach wire disconnected @ the distributor would be the first check. Are you familiar with the 'WHITE' wire @ the HEI distributor?
As for the WHITE wire you mentioned , no I’m not familiar. |
Originally Posted by ZEROVETTE7
(Post 1598145811)
wheathet on or off or running the needle stays down there! Doesn’t move. As for the WHITE wire you mentioned , no I’m not familiar. |
All stock but the cap replaced. |
Originally Posted by ZEROVETTE7
(Post 1598145956)
All stock but the cap replaced. The OPS? Your '91 I believe is a single component with 3 wires. Is this correct? You have the new part? Brand and part number maybe. I saw a post the other day where someone mentioned removing the wiper motor to service that area of the engine. In that thread it was suggested to pull the distributor 'next time'. I've never owned an L98 but it seems likely that if you removed cap and rotor maybe it is an easier reach. I have no idea!! REMEMBER NOW THAT I'VE NEVER OWNED AN L98 !!!!!!! Never serviced one in a C4 either! In an F-body yes. Here is the thread where it was mentioned: https://www.corvetteforum.com/forums...post1598115656 |
you can see where the white wire goes 1986
https://cimg0.ibsrv.net/gimg/www.cor...db53ba437a.jpg
This is all I got - Left hand of the dizzy looking aft |
I’ll look for the white wire and check the FSM. Thx as for the OPS I got the new parts as shown in the photos with the part no. https://cimg2.ibsrv.net/gimg/www.cor...e63bda370.jpeg https://cimg3.ibsrv.net/gimg/www.cor...160a8efb6.jpeg The short one with one pin and three slots. The long one with 3 pins. Just wanna know which wires goes to which as I wasn’t the one who removed them. |
Single pin I'd think is LT BLU (8A50-4). That switch lights the 'CHECK GAUGES' when LOW OIL PRESSURE.
The 3 pin connector should have 3 wires I'd think (TAN,ORANGE & RED) in one connector. (8A20-6) This is for the GAUGE (TAN), FUEL SWITCH (RED & ORANGE) Your part numbers look to be the current sold by ACD. |
Originally Posted by WVZR-1
(Post 1598149005)
Single pin I'd think is LT BLU (8A50-4). That switch lights the 'CHECK GAUGES' when LOW OIL PRESSURE.
The 3 pin connector should have 3 wires I'd think (TAN,ORANGE & RED) in one connector. (8A20-6) This is for the GAUGE (TAN), FUEL SWITCH (RED & ORANGE) Your part numbers look to be the current sold by ACD. Will get into it and update if faced any issues... |
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