Booo it won't start!

[articzap]

I just finished tieing up every loose end I could think of before trying to start the beast. It cranks but won't start. I have not checked for spark yet. SAFC is not reading any air flow % during the cranking process. Fuel pressure gauge shows around 40 lbs. I have not checked for spark yet.

Will a CA start if the MAF is not working?

I turned CAS with ignition on and could hear it prime the fuel pump. I did not listen for injectors. Stupid me.

Whats the best way to check for spark with these these systems? How can I check the resistor pack and igniter to see if they are working?

[boost_boy]

The CA will start without its AFM plugged-up. Pull a coil to check for spark. Listen closely to make sure your fuel pump is also operation when rotating the CAS.

Dee

[carmo]

Pull one of the coils and put a spark plug in it and lay it on something grounded. Then have someone crank the vehicle while you look to see if the plug is firing. Do be very careful! That coil will shock the piss out of you if your careless. Also get a noid light to check for injector signal from the ECM. With the MAF disconnected I have seen some cars run and some not. Either way it would at least sound like its trying to start.....

[DALAZ_68]

Pull one of the coils and put a spark plug in it and lay it on something grounded. Then have someone crank the vehicle while you look to see if the plug is firing. Do be very careful! That coil will shock the piss out of you if your careless. Also get a noid light to check for injector signal from the ECM. With the MAF disconnected I have seen some cars run and some not. Either way it would at least sound like its trying to start.....

wouldnt TDC mess with it not starting?

[greensx]

Mine runs without the maf plugged in but once i plug in the maf it kills the car

[articzap]

Well kind of an update.

The car wants to start. It stumbles to life, hits about 500 RPM then stumbles off till it stalls. Regardless of throttle, it still stalls pretty quickly. It probably runs for about 5-10 seconds.

What I know/checked.

-MAF still unplugged until I figure out how to wire the B13 Sentra MAF-Fuel is being pumped up to the filter and I'm holding about 36 psi-I have spark at every cylinder-#3 cylinder was the only cylinder to have any kind of carbon build up on the plug-No codes are being thrown by then ECU

The only two problems I can think of right now is a bad CAS or stuck fuel injectors.

What do you guys think.

EDIT: I'm 99% sure its stuck injectors. Is there anyway to clean them yourself or do I have to take them to a shop? Or should I start sourcing another set?
Modified by articzap at 8:57 PM 6/22/2008

[DALAZ_68]

i say open it up and let some of that gas evaporate...it could be flooded from the attempts...just a thought...what about timing?

[articzap]

Its not flooded I know that. I also double checked timing. Spot on.

[ca18detgabby]

I would check out vac leaks. Mine didnt run at all when there was a huge leak and a decent leak would stumble and stall.

could be stuck injector

I would see if you didnt flood it as well.

IIRC tim had issues with his butterfly system sticking open..... or something to that effect. might check to see if the TB is stuck as well.

[articzap]

I would check out vac leaks. Mine didnt run at all when there was a huge leak and a decent leak would stumble and stall.

could be stuck injector

I would see if you didnt flood it as well.

IIRC tim had issues with his butterfly system sticking open..... or something to that effect. might check to see if the TB is stuck as well.

There are no vac leaks.

It is not flooded. It actually sounds like it wants to start the more its flooded.

Butterfly system and throttle body both function normal.

[carmo]

I did an SR swap on an old sentra one time and the thing just wouldnt run. I was later instructed by one of the old master techs at the shop to "beat the crap out of the injectors". Apparently its not uncommon for junk yard motors to have stuck injectors. The car ran like a raped date after smacking the injectors with a hammer and 3/8 extension. Good luck

[rovert]

It will run with the MAF unplugged but its the same as unplugging your knock sensor. The ECU just goes into safety mode and it wont run passed 2500 RPMs. And when I say "run" I mean like crap. It should atleast idle smooth with your MAF unplugged as long as everything else is in good condiion. And I second the hitting of the injectors, it worked for mine as well. Other than that, all I can say is triple check EVERYTHING including your resistor box, timing, injectors, spark etc.

[articzap]

This has been running since Friday.

Throttle body return spring had no tension so the throttle body wasn't shut all the way. Simple fix.