what is your coolant temp at when you have starting issues? is it consistently around the same spot? remember, there are fuel trim tables for coolant temp as well.

just a thought.

 

Correct but if you start modifying two tables it overcomplicates things and makes it harder to tune

 

With the help of spectacle I've been tinkering with the IAT Cranking Comp Values. It's a bit of a hassle, but am hoping it pays off in the end.

Before I'd have to WOT at crank for a good 4+ seconds before cranking. Now about 1-2 seconds in if I sense its going to hesitate I give it WOT and she fires immediately.

 

Newest Discovery... the NEW injectors that I just put in show how my luck goes.

With the advice of Inline Pro I parked the car for the night, removed the spark plugs & unclipped all four injectors. I covered the cylinders with a paper towel and had someone crank the motor for a few seconds.

:facepalm:

4 - 3 - 2 - 1

 

I've replaced the fuel injector in cylinder 3 and so far it seems that the car is holding pressure much better!

Going to upload my original cranking maps and compensation tables tomorrow and see how she does.

 

Great Idea I am going to try that my self.

I doubt that is the entire problem though, I am sure there are some other problems.

 

Okay, so new injector went in yesterday and I put back in the original map with -20% cranking fuel trim. The car hesitated starting pretty bad, gave it some throttle and she fired right up. At lunch I swapped it to -30%; same outcome, more throttle fixed it. Tonight I put it at -40% and STILL hesitated starting until i gave it full throttle.

Here are some idea's that I have and wanted to run past you guys.

1) FPR : Got a PM from another user who told me that he had same issue, replaced the FPR and it fixed it. Said his diaphram was warped.
2) Too little fuel : My fuel lines are pressurizing, but losing pressure rather quickly. Perhaps the lines aren't getting fuel all the way to the rail. Then when I stomp the gas at cranking the Short Fuel Trim is going nuts & when fuel finally hits the injectors the injector pulse is through the roof and dumps fuel causing it to fire & smell of fuel.
3) Leaky Injectors when Hot : Stepped out of my car with ECT's showing around 200'. I primed my fuel system and pressure fell off rather quickly. About an hour later, with ECT's down in the 140' range I primed again and the pressure held rather smooth. Perhaps the fuel injectors are leaking fuel when sitting in a hot manifold.


Thoughts? Other idea's to try?

 

Also, tried priming the fuel system 4 times tonight; still didn't help.

 

i don think its cause the pressure is dropping too fast. i asked if you felt like swappin out the FPR earlier in the thread along with an oem pump just to rule that department out too.

still confuses me as to why if it was a fuel thing, why would it go away when you took the injectors out and then it fired right away after you did that....

im sure if Spectacle and i had this car in our possession for an afternoon, we could track it down. its just so hard to have one observer reporting to a diff diag guy. lots of things can get overlooked when there are 2 different people working on 2 ends of the problem. one reporting and looking for stuff and relaying HIS info to the other guy who is diag-ing and suggesting remedies, ya know?

 

I'm actually starting to think that the FPR might be my problem.

Found this online, just randomly searching for 'excessive cranking'.
F. Test for Faulty Fuel Pressure Regulator: If a fuel pressure regulator diagram ruptures it can allow raw fuel into the engine through the vacuum feed line attached to the intake manifold. To check for this condition remove the vacuum line from the regulator and check for the presence of fuel inside the vacuum line, if fuel is present replace the fuel pressure regulator.

If I'm not mistaken, that vacuum line sits right above cylinder 3. And yesterday, when replacing the injector I had a bunch of fuel spray around the engine. When I went to put that vacuum line back on it had a bit of fuel in it. Thought nothing of it, just thought I possibly sprayed some fuel into/on the line itself.

Tomorrow I'm going to go to a local shop in hopes someone has an adjustable FPR. Figure it can't hurt, I've tried just about everything else!