Question about 1988 Oldsmobile Regency

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Engine jurks or miss fires at 50 to 55 mpn

88 olds 3.8 I had to replace the crank shaft sencor and the car has been doing this ever since.

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I replaced the crank shift sensor that fixed my problem.

Posted on Dec 09, 2008


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Check if there is any blown 15 or 20 amp fuses. Located in the engine compartment. There should be a Breaker box with fuses and relay switchs in it. Look for Ignition or Ing.
I know some cars don't have names for fuses on the breaker box cover like ford. If so look up in the internet. As in cirucit breaker digram - If fuses and relays are good then fine. Then If remeber correctly check the fuse box under the dash board or in the glove box. Some
Chrysler Products like my Dodge van has two fuse boxes. One under the dash or in the glove box, as well in the engine compartment. Also look for PCM or ECM fuse too, ECM means, Engine Control Modular It also controls engine spark and fuel injection as well as other things in your jeep. Its fuses for that is 7.5 amps with 5.6 volts. If these of good. Then replace the coil and crank sencor or have it tested at Autozone. A bad crank sencor most defintly would make your car to not have spark. It works with the movement of the engine with little windows on your crank shaft with the front crank shaft pully or in the back of the engine inside the bellhousing of the transmission. Most likely on the side of it. Its tell the onboard computer were to fire spark with fuel injection. Without it the computer dont where to spark the #1 or #2 or #3 pistions for that one, its 6 cyilders. Hope this helped, wish you well.

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Motor is miss firing p3o3 changer ecu after few mins mis fires is my crank position sensor not reading the third cylinder for some reason i did a motor swap ran new motor 3 or 4 hours had miss shift...

your crank position sensor does not read individual cylinders, only the position of the crank shaft. make sure the plugs and wires are good, check the spark coming from the coil, make sure there are no vacuum leaks at intake manifold, check timing, then do a leak down test to make sure you don't have a bent or damaged valve in the cylinder head.

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Was told cam postion sencor might be bad? Replace not it! now was told my autozone guy might be crank sencor? But need a pix or something i can't find it? your help is needed! Thank you Darren

well i dont know what year is but the crank position sensor is locate it behind crank pulley in order to have acces to the sensor you ne to remove the pulley first. Note when the crank sensor is bad there should be no fire at your sparks. before keep spending more money dont know if you checked for gas coming to the engine.

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Replaced everything under the sun on our 87 olds delta 88...wont fire on its own but will fire and run fine as long as u shoot it with starter fluid. We replaced starter, fuel pump, filter, plugs, wires,...

Can you here the fuel pump running?no, check fuse,and pump relay. Check pump fuel pressure,at the fuel injector rail,or throttle body. Check for voltage at the top wiring on the fuel nozzel.While cranking look for pulsating voltage.None, test computer,scan system. let me know the outcome.

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Lower left of engine near oil filter (2).

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While driving, the engine dies.

I had the same thing happen on a 91 Olds 88. Replaced crank shaft position sensor, coil, and ignition module. That solved the problem. I think the culprit was the CSP Sensor, but changed all three so can't say for sure.

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