Re: Spark plug ?Re: Stumbles and misses when accelerating - Saab 900 Bulletin Board - Saabnet.com
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Re: Spark plug ?Re: Stumbles and misses when accelerating
Posted by DaleG (more from DaleG) on Wed, 6 Oct 2021 08:07:26
In Reply to: Spark plug ?Re: Stumbles and misses when accelerating, Ko Denhamer, Tue, 5 Oct 2021 05:46:30
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I appreciate everyone's input to recap I have put in new Bougicord wires, new NGK plugs with proper gap, and Bosch cap. I put in new Bosch fuel pump with working pre-pump, new Bosch fuel filter. Checked both fuel pump relays above ECU- OK. I have switched out the following components with known good ones, ignition control module, AMM, ignition coil, APC control unit, and ECU. I have gone over all of the turbo plumbing with a fine-tooth comb - no leaks. All vacuum tubing seems to be in good shape - no leaks, turbo bypass valve / hooter valve OK. I have switched the Fuel Pressure Regulator and installed a new distributor Hall sensor. It still consistently misses and stumbles on acceleration almost to the point of stalling.
Even though I installed a new Bosch fuel pump 2 months ago and switched fuel pressure regulators I ordered a fuel rail fitting to attach pressure gauge and measure the actual fuel pressure. Hopefully this will arrive soon and I can do a fuel pressure test while accelerating. Any others suggestions as to what to check would be appreciated.
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