Air flow sensor Probleme

Air flow sensor: Air flow sensor. It detects how much air is flowing into the engine.

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Starts but runs terribly

Buick LeSabre 1998 3.8 200000 km

The crank position sensor went out going down the road, I got it back home and changed the sensor, now it will start but has a bad misfire, I’ve replaced the map sensor the maf sensor the iac valve and put new plugs and wires on it

Johnny aus Vereinigte Staaten vor einem Jahr

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JRA86 aus Vereinigte Staaten vor 8 Monaten

Johnny has already replaced the MAF, MAP, IAC, plugs, and wires. Since the car started misfiring after the crank sensor and tune-up, the issue is likely related to the work performed. Wrong Firing Order (Most Likely): Johnny mentioned putting on new plugs and wires. It is extremely easy to swap two wires on the coil packs of this engine. Check: Verify the wire routing. The coils are numbered, but they don't always follow the physical order of the cylinders. The Harmonic Balancer: To change the crank sensor, you have to remove the harmonic balancer. If the "interrupter rings" on the back of the balancer were bent or if the balancer wasn't seated perfectly, the new sensor will give a "dirty" signal, causing a misfire. The Ignition Control Module (ICM): The crank sensor plugs directly into the ICM (the plate under the coils). If the pins are corroded or the connector isn't seated perfectly, it will misfire. Vacuum Leak: Since he replaced the IAC and MAF, he may have a vacuum leak from a gasket that didn't seat right or a vacuum line that was knocked loose during the repair. Recommendation for Johnny:
"Johnny, double-check your spark plug wire routing first—it’s the #1 cause of misfires after a tune-up. If that's correct, check for a vacuum leak around the new IAC/MAF. Finally, ensure the harmonic balancer wasn't damaged during the crank sensor install; if those rings are bent, the sensor can't 'read' the engine timing correctly. "
Johnny should verify the following:
The Firing Order: 1 - 6 - 5 - 4 - 3 - 2
Cylinder Numbering (Standing at the front of the car):
Rear Bank (closest to the windshield): 2 - 4 - 6 (Left to Right)
Front Bank (closest to the radiator): 1 - 3 - 5 (Left to Right)
The Coil Packs: On most 3800 engines, the coil towers are labeled. He should look closely at the plastic base where the coils sit; the numbers for the corresponding cylinders are usually molded right into the plastic. If Johnny finds that even one pair of wires is swapped (like 3 and 5), the engine will start but have a constant, heavy misfire exactly as he described.