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Old 11-02-2018, 01:13 AM   #1
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Join Date: Nov 2018
Posts: 4
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Default P0300 trouble. Desperate

Okay so short and quick. I have the p0300 code and egr and map codes. Check engine light flashes. Its a 1996 tahoe 4 door with 93k. Retired fire marshall truck. Bought it at 70k. It idles perfectly and will go 70mph when it wants but the light flashes, sometimes vibrates a little sometimes it doesnt. Ive been chasing this code awhile aimlessly throwing parts at it. Ive changed...
Fuel injectors to the upgraded system oem
Fuel pump and filter
Pcm or ecm or ecu whatever (the computer)
Crankshaft positioning sensor
Distributor cap and rotor shaft and all
Plugs and wires oem
Ignition control module
Also have 02 sensor codes but that wouldnt make it miss and hesitate would it?
I cut the exhaust before the cats to see if they were plugged, didnt help welded back on so there is still a small exhaust leak.
Changed map sensor and egr
Fuel pressure is 55-60psi
Set the retard to 1 with a scanner when i put in the distributor shaft
Today i put the fuel pump in and disconnected the battery for like 2 minutes and took it for a drive. Havent cleared codes in a while. So cel was on. But ran like a raped ape for like 2 miles went 70 no problem then light started flashing again... no leaks fresh oil change.
Any tips and advice is appreciated i just want my 4x4 again for the winter. My bmw has been the reliable one surprisingly...
I dont know where to go next, ignition and fuel systems have been replaced... ruled out vacuum leak because of perfect idle.
I will stay active please and thanks.

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