Ok, so car wont start. Ive got it to start a few times and even idle once but now it just wont start. It will crank over and sound like its about to catch but then go back to no luck.


Seems like it keeps flooding. Ive done the proper deflood procedure way numerous times over numerous days (top plugs come out egi fuse it pulled and crank). Even tried ATF ( got it started once), (seafoam) got it started once, and push start.

Checked/ replaced:
Replaced Sparkplug wires
Replaced Sparkplugs
Replaced MAP sensor
Replaced Ignitor
Replaced numerous fuses and relays

Checked the battery have in on a solid charge to keep the volts up.
Checked for spark
Checked for fuel ( smell it and can see it on the plugs after a while of cranking)
Checked for decent compression with compression tester (even bounces and 95psi with standard compression tester) .

Things ive noticed that might cause the problem.

In the sensor check on the pfc handheld the FPR will fluctuate at times when cranking.

There is a excessive amount of white smoke and what now looks like oil leaking from the turbos. Possible blown O rings?

My injector duty on the pfc hand held will jump from 5-50 % at times when cranking.

 

seems responses are hard to come by anymore..

I believe that the fpr readings and the injector duty readings are normal during cranking.

Might want to check inside the intakes for additional oil leaking.

I think the manual (found in faq area) has troubleshooting for causes of flooding.

Sorry I cant help more right now.

 

How many miles do you have on the engine? Have you had to add any coolant to the engine over the course of the last 6 months or so? The white smoke statement has me wondering about the coolant seals in your engine. Mine was pretty much doing what yours is in its final days.

 

Coolant seems fine but i cant confirm this as i bought the car not running.

The white smoke is definitely a mixture of Seafoam/ATF that hasn't been cleared out because the excessive amount of it only started once i tried the seafoam/atf trick.

I know excessive flooding is a sign of low compression but it definitely is making decent compression.

 

Check the injectors. They may be stuck. Happened to me. Do the click test. https://www.rx7club.com/3rd-generation-specific-1993-2002-16/help-im-flooded-wont-stop-849787/.

 

Hmmm will have to do this. Honestly i only checked for fuel by listening to the fuel pump and the smell of unburnt fuel. So, im gonna rip off the UIM again and swap with another set of stock injectors i have.

Its weird, i can start it on full throttle and with full throttle it will rev max to 1k rpm and slowly die down. Once it turns off ( usually within a minute or two) it wont turn on again till a few hours later of leaving it to itself.

Im guessing it keeps flooding and then drying out over the time its left alone.

 

Starting the car with the gas pedal floored basically cuts fuel delivery for starting. So if the car is flooding from some injectors not working properly, holding the gas pedal to the floor while starting can help get the car started.

 

we tried that.. and funny how the car still seems to flood..? on the commander it reads 5-6% inj duty but then after a few cranks its spikes from anywhere to like 21%, 30% and has even gone up to 50-60% injector duty just trying to crank the car... is this something the computer is trying to compensate since we cut the fuel by depressing the gas pedal?

 

BUMP......

Update:

Pulled the injectors they definitely look like they have been modified by the previous owner but none the less no leaks from them.

I tested the injectors and got a nice clean stream of fuel so they do work. Kind of pissed that they do work because now im waiting on insulators to put them back together which means even more down time.

Once everything is back in im going to swap out the crank angle sensors and see if that works

Anything else worth a try?

 

Bump

Changed crank angle sensors.... No luck same thing.

One rough hard start that will only stay on at full throttle and then eventually die out moments later.

I pulled the plugs ( new plugs) starting to think what i thought was fuel may be coolant. I don't have a cooling system tester and cant get the car to stay on long enough for a champagne glass test.

Im about to pull the trigger on a rebuild short block but worried it might be some other sensors. Which sensors should be checked for proper resistance?

 

Follow up lead on issues found/possible problem


https://www.rx7club.com/power-fc-forum-47/starting-issues-pfc-shows-bad-sensor-voltage-help-853516/