Will a P0308 computer code on a 97 ford e350 7.3 psd turbo cause the engine not to start at all? i am at a still cranking no start condition. randomly died first acted like it was starving for fuel. code p0308 and code p1662 is showing on the computer. help please.

If the engine is misfiring the check engine light would be on and blinking and the engine control module (PCM) would store a fault code or codes for the cylinders that are misfiring. A lean code will not cause a misfire unless the engine has a vacuum leak most often at the intake manifold gaskets. A misfire code looks like this:

P0300-P0306 for 6 cylinder and P0300-P0308 for a V8.
P0300 indicated a random engine misfire, this can be caused by all kinds of issues.

Must be a FORD product. The code means the computer has detected a cylinder misfire. Read the following info.
http://www.obd-codes.com/p0308

I have your vehicle as a 97 Ford Expedition...Is this correct? Reason I ask is that Ford uses Coil-On-Plug and you said "I changed the wires"...Which would mean all eight coils were changed...P0308 is telling you the ECM is seeing a fault on cylinder #8...I would strongly suspect a bad coil for that cylinder...Question; Did you change all eight coils? If not change #8...saailer


I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

code po308 has an engine mechanical fault as one of the causes so I have to ask have you checked to see if the cam shaft is turning or is the belt broken

cylinder 8 is missing combustion which caused the o2 code the black box will not cause a specific cylinder to miss, there fore a fuel distribution problem is evident, the injector on eight is proablly the culprit the #8 cylinder is the last cylinder to be fed a fuel, pressure test is needed to determine if the fuel pump is strong enough to deliver diesel, ambulance spend a lot of time idling causing fatigued fuel pumps

Misfire condition on cylinder 5 (P0305) and cylinder 8 (P0308). There is a good explanation of it here :
http://troubleshootmyvehicle.com/ford/4.6L-5.4L/how-to-diagnose-misfire-codes-1

Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The vibrating tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Hello, If you have a battery charger, throw them on charge overnight. No more than a 3amp trickle charge. If you can charge one battery, and you can jump the truck by hooking the other battery to jumper cables, then you have identified the problem as low/dead batteries.

And yes, PSD's make a lot of noise on start up. A difference you will notice between the cumming and the psd engine at start-up is that the psd cranks longer. This is due to the fact that the fuel injectors on the psd are actuated by oil pressure.

Thanks

If you have a battery charger, throw them on charge overnight. No more than a 3amp trickle charge. If you can charge one battery, and you can jump the truck by hooking the other battery to jumper cables, then you have identified the problem as low/dead batteries.

And yes, PSD's make a lot of noise on start up. A difference you will notice between the cumming and the psd engine at startup is that the psd cranks longer. This is due to the fact that the fuel injectors on the psd are actuated by oil pressure. Welcome to the world of powerstrokes.