Rebuilt motor turns over, but quickly dies

[importracr317]

I recently finished putting my car back together and have had a heck of a time getting it to start. I finally got the car to start tonight, but it won't stay running or idle.

When I turn the key, I've got to pump the gas to get it to fire and keep pumping the gas to keep it running. If I let off it immediately dies.

I'm thinking the gas is bad (used octane booster and stabil when I started this process about 12 months ago), my plug wires are wrong (I mounted the coil packs to the JMF bracket but forgot the number for each coil) or I've got some type of throttle body sensor issue.

The fuel filter is new, and it does run if I give it gas, so I'm kinda stumped.

Thoughts?

Thanks guys.

 

[Boomdeeze]

Fix your firing order and it should start and idle. Sounds exactly what happened to me when my firing order was wrong.

 

[Indian]

Aslo, double check all your vacuum lines to make sure you dont have a vacuum leak.

 

[euphoria]

Fix the firing order and it should be fine as long as the wires are new as well as the plugs . Also I wouldn't worry about the fuel going bad. I had a GS-T sit for 2 years then once I finally rebuilt it, it ran fine with the 2 year old fuel that was in the tank.

 

[1gcrazy]

cts

 

[importracr317]

cts

EDIT: NM, Coolant Temp Sensor, got it.

Is there any way to tell what coil goes to what cylinder by just looking at the packs (not the plate the packs are conencted to)?

That's my problem with the firing order - I took the two coil packs off the mounting plate so I could bolt them to the JMF relocation bracket and don't know which coil goes where. I know the order (4-3-2-1 from the passengers side of the motor to 4-1-2-3 on the coil pack), but without the OEM mounting plate, I'm lost.

Plugs and plug wires are also new BTW.

I will be checking all the vacuum lines, but with the Magnus SMIM, it's pretty simple - just 4 lines, only 2 of which I've t-ed into....hmmmm.

Thanks everyone.

 

[importracr317]

Pretty sure the problem is the firing order.

Soooo, is there any way to tell what coil goes to what cylinder by just looking at the packs? Anyone?

 

[XiKeiyaZI]

Had the same issues with mine.

Is your MAF plugged up? ;P

Also, check the wiring on it. Might need to be rewired if there is any exposed wiring.

As far as firing order... my coils have them labled..o_o...Then again mine is a 90.

^^ Good luck

 

[importracr317]

Had the same issues with mine.

Is your MAF plugged up? ;P

Also, check the wiring on it. Might need to be rewired if there is any exposed wiring.

As far as firing order... my coils have them labled..o_o...Then again mine is a 90.

^^ Good luck

Nah, the MAF is fine, all the wires are good.

I've been googling around for images of a stock 2G coil pack. I should be able to figure it out....I'll know by tomorrow.

 

[steve]

Soooo, is there any way to tell what coil goes to what cylinder by just looking at the packs? Anyone?

I'm not sure if the wires from the plug are long enough to change the relative positioning of the coils but if you follow the wires from the plug to the coils the yellow/green wire goes to the coil for cylinders 1 and 4 where the yellow/black wire goes to the coil for cylinders 2 and 3 normally.

That would only change if you are running a 97+ ECU in a 95/96 car or a 95 ECU in a 97+ car and in that case they swap.

 

[importracr317]

UPDATE: my AFPR was reading about 40-43psi with the vacuum line attached. I know I need to set it to 43 psi w/o the line attached, but what is puzzling was I had to add fuel with the AFC to get it to idle. If the pressure was too high, shouldn't I have needed to take fuel away?

Also, my AEM wideband was registering so lean it was just giving me a "--" between 1.5-2K rpms. Weird.

Thoughts? I suppose I'll start with correcting fuel pressure and see what happens.

 

[steve]

There could be many things wrong.
I see from your profile you have a SAFC Neo, is it a current one with the Karman MAF bug fixed or and older one that might be buggy.

Both your fuel pressure guage and your actual injector flow rate are questionable.
Any injector sealing problems will also cause issues like this. So boost leak test, double check your gauge and injectors.

 

[importracr317]

So boost leak test

That's where I'm headed as soon as I get the fuel pressure right.

The NEO was purchased pretty close to when they came out, so yes, it's older - never heard of them being "buggy"....any threads for reference?

Thanks for the help here steve.

 

[steve]

http://www.dsmtuners.com/forums/art...294820-apexi-neo-karmen-airflow-problems.html

http://www.dsmtuners.com/forums/newbie-forum/304105-apexi-neo-important-info.html

 

[bsbllfit7]

i believe the firing order from left to right on the coils is 4123 lemme double check and get back to you though

yes that was the correct order.

 

[steve]

i believe the firing order from left to right on the coils is 4123 .

Just a little pet peeve of mine but that's not the firing order, just the order of the plug wires on the coils.

The firing order is set by the crankshaft and cams to 1 3 4 2. You can have the plug wires connected incorrectly so that the plugs fire at the wrong time but the firing order is fixed in steel.

Since he moved the coils out of their mounting bracket I couldn't be 100% sure if they were still positioned the same as factory which is why I told him the wire colors for the trigger to the coils and which cylinders they were for.