Ok story first....

The motor is a fresh rebuild car started, and no longer starts anymore. Bought the car in parts, put everything togeather dropped the motor in 2 weekends ago.

First start up the car started up pretty quick ran idled was getting some extra fuel from 850 primarys. but started and idled for about 10 mins...since that time i started it about 5-6 times and each time it slowly got a little worse till now where it only turns overand does not start.

I figured maybe i flooded that car so i first started by taking the plugs out and cleaning them up good and cranking the motor over with no plugs in and the fuel pump fues out to clear out any extra fuel. that did nothing...tryed that a few times with no start...next i tried to and a little oil in the rotor chamber thinking freash rebuild probably pretty easy to wash the oil out, even though it sounded like it had good compression. that changed nothing....next i was ok lets go to square one and put 550cc injectors back in. and set the power FC back to 550 injectors and the base map that comes on it.. so I did that and that changes nothing.

I have checked spark, thats good on all 4 plug wires. they are brand new plugs. i pull the plugs out and there is gas on them. so i know its getting fuel. checked the fuel pressure...and thats at about 50psi, so thats good. i checked the compression and that turned out perfect....about 120-130psi cranking for about 7 seconds on a healthy battery. I tried a stock ECU just to see if it would start on that, that didnt work..

The motor as it sits right now is a fresh rebuilt street port motor, stock injectors all around. stock intercooler setup, new bur9eqp (not 100% on that part number but all 4 are 9's) spark plugs. i Power FC ECU set with the base maping that comes on it.

I dont know where to look next...I have fuel, spark and compression....I am so lost. any ideas? sorry about any english or spelling errors...not my strong point. lol next then i was thinking was maybe try pop starting it???? read that as one of the last things to try in a flooded motor....i have been trying for 4 days now to figure this out

I just want to drive my car for the first time before winter thanks in advance

Seth

 

I think the plugs may be too wet/dirty to fire, EVEN IF THEY WERE BRAND NEW when the flooding occurred. Try some new plugs. It has been noted here many times that once flooding occurs, the plugs that were in there at the time will not be able to start the car until the flooded condition has been overcome.

You may be able to use the ones you have at some later date.

 

Buy new spark plugs($24.00) You can completely foul them out in less than 10 minutes of use where cleaning them will do nothing for you. Buy new plugs see if that helps.

You are sure the injectors are spraying? Positive?

DaveW beats me to the punch.

 

Ill try new plugs, as for the injectors i ampretty sure they are, i have tried the 850's and now the 550's. there is gas that is getting in there you can smell that lol.

Seth

 

Make sure to adjust your fuel pressure:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/setting-fuel-pressure-733070/

You could be unintentionally flooding your engine.

 

Yeah, I also think the fuel pressure needs to be lowered a bit. that may have a lot to do with the flooding issue. You may also adjust the idle in the pfc to idle the car slightly higher than the stock 800 to help compensate with the porting.

 

Check to see if any of the injectors are stuck open.

 

How was your oil pressure when you first started and ran the new motor?

 

dont remember the exact numbers but it was some where near half way up if i remember right...no odd sounds or anything.

Seth

 

you didn't even make any adjustments to the injector settings? hell, even if you did try to fiddle with the injector settings it's going to run like crap without a tune. Even with 550's it runs like crap without a tune, at least relative to the stock ECU.

with 850 primary injectors I wouldn't even bother trying to run the car without a tuner with you. Utter waste of time. even if you set the injectors the way most people set them (negative lag settings) it will need a lot of tuning after that. Professional tuners spend a lot of time on cars with 850 primary's to get stock driveability. What is your setup? Big single? Or did you try 850/850 on stock twins? Do you even need them?

just tow it to a shop. Or put the stock 550's back in. You are going to have one problem after another until you get some real tuning done.

 

He said he did in his original post:

 

who rebuilt the motor? do a compression check with a tester.

 

In his 1st post he said the compression tested "about 120-130psi cranking for about 7 seconds on a healthy battery."

 

so i tried putting the fuel pressure down to about 38psi without vac. that did not do anything....i did get it to start on starting fluid and run for a second or 2 before dying. primary injectors not firing??? one maybe? there is still gas on the plugs when i pull them out after trying to start for awhile....ideas?

Seth

 

Did you install new plugs like I suggested?

 

I would set the fuel pressure between 36-40 psi and install new plugs. If you have spark and compression it should fire right up.

 

the 850cc injectors were newish, with just a couple thousand miles since being flow tested and cleaned, and had just come out of a well running car, so those should be fine. as for the 550cc injectors, they were fine when i pulled them but i cant tell you for sure if they're still ok, they did sit for almost a year.

the PFC wasnt mapped for the car, i bought it and never mapped it since i never got the car together before i traded it to Seth. So thats an issue, but it sounds like you got that figured out fine anyhow.

 

So I touch the injectors out and tested them. The primaries are not firing at all. So I went from a too much fuel to no fuel lol. Got to find another set and update from there.

Any mass locals have any

Seth

 

Have you tried to get them cleaned? If you get them cleaned they should be able to test them as well and let you know for sure if they're good or not.