What could cause an intermittent engine miss on a 1990 Olds 98, 3800 V-6 fuel injected engine. see details?

Question

We had a crank sensor replaced. So they said, it quit running, so they said they supposedly replaced that. It runs now but misses when you accelerate while driving. Even spits back through the intake. Looks like it has a new O2 sensor on it. I unplugged that but it did not change anything, so I re-plugged that. Checked plug wires, they look good.

Answer 1

plug wires may look ok but they need to be replaced every 25 000 miles, also have the coil packs checked they have been know en to cause intermittent mis fire.and it wouldn't hurt to have the injectors cleaned.

Answer 2

Wires, coils or ignition module will cause intermittent miss...coils and module should be replaced as a set as when one of them goes bad, it puts a strain on the other components and the rest will probably fail soon too especially with high miles. The engine heat degrades them and causes high internal resistance....may not show up as being bad when tested if they are tested when cold. Wires can be checked with an ohmmeter for resistance. Plugs should be checked or replaced.

Answer 3

gasoline injection can artwork on an old truck. you would be nicely off to locate a donor motor vehicle with a good, gasoline injected engine. you need to use the wiring harness and pc from the donor motor vehicle. Mark your wires earlier you get rid of them as you will have not have been given any instruction manual to re-assemble this on the different motor vehicle. save each little thing. decrease no longer something on the wiring harness. you do no longer comprehend what you may want later. anticipate to accomplish a little fabricating. There are aftermarket engine administration computers which would be used with some production gasoline injection structures. this could boost your funds, yet could be much less issues in the long-term. additionally, agencies like Holley and Edelbrock make comprehensive gasoline injection structures of old automobiles and warm Rods. those are comprehensive structures with all the wiring, pc, hardware, and application. they are in lots of circumstances self studying yet could be positive tuned with a working laptop or pc pc. the solid area approximately those is they are comprehensive kits with good training. With gasoline injection, you will want a clean gasoline pump. gasoline injection demands greater gasoline line tension than a carburetor. you besides could ought to run a gasoline return line back to the gasoline tank. Use intense tension gasoline line rated for gasoline injected automobiles. carry on with the link under to work out if one is attainable to your application. gasoline Injection is expensive. anticipate sticker ask your self. yet gasoline injection, if carried out properly will make the engine run smoother and is cool on an old motor vehicle. till it looks like a hack interest, then it seems stupid.