Car Dies

[blue62]

Originally Posted by gabedrummin

Smells like gas. Plug has maybe 2k on it.

So do they all smell like gas???
what is your fuel mileage???

I need a little info
you say the car idles at around 700 RPM if you accelerate slowly everything is fine.
If you accelerate quickly it bogs until around 1500 RPM then smooths out.

So here is what I need to know: is this while driving or parked in neutral???

Also what happens if you go wide open throttle from 1500???? does it accelerate normally or???

My thoughts are, well actually more of a guess, is that you have one or more injectors that are leaking.
The bog when trying to accelerate from idle quickly "could be" from to rich of a mixture from a leaking injector or injectors.

Once your at 1500RPM the engine is starting to breath getting more air and it is bringing the rich mixture more inline. So the engine smooths out.
If the car will accelerate more normally from 1500 to wide open throttle that would kind of go alone with injectors leaking because the engine is demanding all the fuel it can get under those conditions. And being a little rich is what it needs under those conditions.

If the car bogs when you try to go from 1500 to wide open throttle then we have another issue like not enough fuel.

But I need the above info and a vacuum test and maybe another test or two to rule out some things, like poor cam or valve timing, vacuum leaks, to low or to high of fuel pressure, air metering- measuring issues...
Hope this all make some sense....

[gabedrummin]

I connected the durametric and it shows cylinder 4 with misfire's . I do have to admit I don't know what I'm looking at . I'm not a professional mechanic and I don't understand what I am seeing when using the durametrics software .There is a box for each cylinder .I put a check in each box at the left for each cylinder ,on the right side of the page is a box and for each cylinder and for cylinder 4 I see the number counting up .So I assume there is a problem with cylinder 4 . I don't think I used my words right to explain the problem . When I try to accelerate the engine runs choppy its not revving cleanly .What I said was a bog is the engine not having that snappy response when you hit the gas . I hit the pedal fast the motor cant rev fast because its back fires thru the intake as the engine rpm increase and once it gets above 2 thousand rpm I don't notice it running bad .When I press the gas slowly the motor has time to accelerate . And I don't hear backfires. So I guess you are all right its either a bad injector or I have a dead cylinder . I guess I could change the coil pack to another cylinder But I doubt the miss fire will follow the coil .I don't think its timing or it should show one or both banks with a problem ? Porsche dealer had said multiple cylinders were misfiring but I don't see that . I see one. If this was a fuel pump problem I think all cylinders should have an issue .When I had the heads off the car all the cylinders looked great no scuffing no scoring a nice even colored wall . I have been a tool maker for 35 years and understand making parts and the walls were not worn . I so do appreciate all your help and patience helping me .Thank you all

[blue62]

Originally Posted by gabedrummin

I connected the durametric and it shows cylinder 4 with misfire's . I do have to admit I don't know what I'm looking at . I'm not a professional mechanic and I don't understand what I am seeing when using the durametrics software .There is a box for each cylinder .I put a check in each box at the left for each cylinder ,on the right side of the page is a box and for each cylinder and for cylinder 4 I see the number counting up .So I assume there is a problem with cylinder 4 . I don't think I used my words right to explain the problem . When I try to accelerate the engine runs choppy its not revving cleanly .What I said was a bog is the engine not having that snappy response when you hit the gas . I hit the pedal fast the motor cant rev fast because its back fires thru the intake as the engine rpm increase and once it gets above 2 thousand rpm I don't notice it running bad .When I press the gas slowly the motor has time to accelerate . And I don't hear backfires. So I guess you are all right its either a bad injector or I have a dead cylinder . I guess I could change the coil pack to another cylinder But I doubt the miss fire will follow the coil .I don't think its timing or it should show one or both banks with a problem ? Porsche dealer had said multiple cylinders were misfiring but I don't see that . I see one. If this was a fuel pump problem I think all cylinders should have an issue .When I had the heads off the car all the cylinders looked great no scuffing no scoring a nice even colored wall . I have been a tool maker for 35 years and understand making parts and the walls were not worn . I so do appreciate all your help and patience helping me .Thank you all

A backfire thru the intake can only happen from:
Bad ignition timing
Bad intake valve timing
intake valve sticking open
collapsed intake lifter
weak or broken intake spring
something that allows the burning fuel/air to leak past an intake valve.
Something that prevents the intake valve from sealing properly at the correct time during the combustion of the fuel/air mixture.
any one of these things could cause a misfire.
If you have backfires into the intake you have one or more intake valves not fully sealing or not sealing at the correct time.
A vacuum test should show a ticking needle every time that cyl. comes on the intake stroke.
If you have multiple valves out of time or not sealing you will have low vacuum possibly with a steady needle or possibly with a drifting or ticking needle.
A compression test should also show lower compression for that cyl. or cyls if the intake valve-valves are not sealing or are out of time.

So at this point I think a vacuum test and a compression test on all cylinders is very important to try and pin down your issues.

Until we know that you have proper vacuum which relates to proper compression, we are going to chase our tails.
When a cylinder does not fill properly with the fuel/air mixture at the correct time,or burn at the correct time it can look like many many other issues.
I think cylinder 4 misfires are caused by an intake valve issue the fuel air/mixture is not burning correctly leading to the raw gas smell.
Which is leading us to think you have injector problems.
Is cylinder 4 one of the plugs that smell like gas??????

So you could have more then one issue.
Intake valve issues on at least number 4 cyl. and possibly fuel injector issues.