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Re: 1996 Buick Regal Custom w/3.1 liter-No Spark
Disconnect you battery. take something and fray back the plastic on the main hot wire on the coil. take another wire and wrapp it to the main wire you just frayed. now take that wire and run it to you ignition fuse. re connect you battery and see if your vehicle will start. if so than you have either a break or a short in you hot wire for your coil.
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code p 0307 is misfiring on no 7 cylinder ====causes --- engine mechanical fault ---wiring---ignition/ fuel system--injector --ECT/MAF sensor---ECM
look for low fuel pressure or ignition control module
code p 0300 is random/ multiple cylinders ----misfires detected ===causes ---spark plugs ---HT lead/s---injector/s---ignition coil/s---low compression---wiring
he has changed a lot for nothing
a 5 year old engine can have a lot wrong with it --so new out of a crate is no guarantee
most misfires are from injector problems
it could be a loose valve seat insert so have a compression test done if moving the injectors to new locations doesn't move the misfire
Your engine needs basically four things in order to start:
> Volumetric efficiency (V) > Air/fuel ratio (A) > Compression (C) > Ignition (I) V + A + C + I = POWER
When there is no POWER (engine will not start), it is because one (or more) parts of the equation is missing. PRELIMINARY diagnosis is to determine which parts of the equation are present and which are missing. Then PINPOINT diagnosis is to determine WHY the missing parts are missing.
Until preliminary and pinpoint diagnosis is completed, nobody can do much more than GUESS what could be causing your problem.
With that said, you need to find out whether it is fuel or spark, or BOTH at the same time. The actual location of the problem can be narrowed down considerably by knowing this.
EXAMPLE: If there is fuel PRESSURE (verified by using a fuel pressure gauge) but there is no injector pulse or spark at the spark plugs, the cause would most likely be a cranshaft position sensor problem, because this will affect BOTH. This scenario would also completely rule out a fuel pump malfunction. However, if there is fuel pressure and injector pulse, but no spark, the problem would be more likely caused by an ignition control module, because this has nothing to do with your injectors or your fuel pump.
Before I went too much further throwing parts at it, I'd have fuel pressure tested. Not uncommon for low fuel pressure to starve a cylinder or 2 and have a misfire code come up. Should only take mechanic about 5-10 minutes to verify low or o.k. , then you can eliminate that possibility.
if it runs on starting fluid its a fuel problem.. check fuel pressure even if its a couple of pounds off, the vehicle will not run. but using starting fluid may give you the extra poundage you need to make it run . also check vacuum hose at pressure regulator on fuel rail