gabeowen

As stated I have a '97 Nissan Altima that RAN GREAT until about a month ago. My daughter drove it to a relatives house and their driveway is sandy and rough. Since that day the car has had this major issue. So, now you know when the issues stated. Here is the issue and I have not found the resolution, even searching this forum and others..

When driving at 1/4-1/3 throttle down the road, the car bucks and hesitates.. The CEL blinks and comes on. The codes show #1 cylinder misfire. That's it. It is ONLY at 1/4-1/3 throttle it hesitates. Any more throttle or less it runs perfect. It Idles fine and runs great at 1/3+ throttle. It is only that range.

I replaced the plugs, wires, distributor + rotor thinking that was the issue. I just paid $1800 for the engine rebuild along with a brand new head and radiator from a reputable shop that has done alot of work for me prior to putting my daughter in the car. It has less than 2000 miles on the new parts and new timing chain too.

Again, the car runs like new at idle and any past 1/3 throttle. I've looked for vacuum leaks(maybe not hard enough?) and sprayed around the intake to find no raise in rpms..

Any thoughts? I'm completely at a loss... I do not suspect a intake gasket since it idles fine, no raise in rpms when sprayed, and happened after a rough ride down a rough driveway by a teenager..

Thanks

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gabeowen

So, checking the CEL codes again, it still says Cylinder #1 Misfire (NOT #4). Also, spraying starter fluid around the injecter area netted absolutely no change in rpms again. So, I suspected #1 injector (?) and swapped the #2 injector with #1 injector, reset the CEL light, and then drove the car for about 10 miles easily 1/4-1/3 range which resulted in a CEL saying Cylinder #1 misfire..

So, the injectors are ruled out for me. I'm completely out of ideas.

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justin260z

Wiring?

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yankee

misfire cyl 1 run rough bucks check egr by vaccum plug off if runs ok then you will have to figure out if it is egr valve or solenoid or transducer

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kjones

Had the same issue on my daughter's 96 (237k), new plugs,wires,cap,rotor,egr,transducer. No luck. Unplugging the egr eliminated the misfire but brought up an egr cel. Stumped. Wound up drilling a hole in the top of the egr and running a 1/4 bolt and nut(to lock it in place) down through it so I could limit the egr piston travel to about 1/8 inch. 2000 miles later all is well. No misfire,no emissions faults,runs excellent.

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