(RB20DET) WHERES THIS PLUG GO?!?! HELP!

[smitty4130]

Finishing up my rb20det install into my 95 S14. The cars not starting and i think its because of this plug coming off the wire loom near the fuel rail.



Please help
Modified by smitty4130 at 4:18 PM 5/5/2009

[smitty4130]

ok i found this laying around and it plugs in.... but what does it go to???

[Carl H]

knock sensor sub harness...does not need to be plugged in for proper operation but will not run in the high timing maps unless they are plugged in.have you checked the fuel lines?

[smitty4130]

Fuel lines were on backwards. Valves are tapping. I have to pull the motor. I hate this car!

[Carl H]

might just be noisy lifters...its not too uncommon...let it pump up for a few minutes and if it doesnt go away in a few miles then pull the head apart.

[Joe]

Fuel lines were on backwards. Valves are tapping. I have to pull the motor. I hate this car!

damn dude overreact much?

let it run for 20 minutes.

[smitty4130]

Maybe I am over reacting. The car still wont start. It sounds like it wanted to but it just doesnt. I'm getting spark, i'm getting fuel and i'm getting air. why isn't it starting??? And as far as the tapping I took the exhaust valve cover off and i can feel it on the #5 aft lifter. I just don't get why it would be tapping. I rebuild the head, used all new hardwear. lapped the valves, triple checked all my clearance's. That head is perfect... i suppose the lifters could be noisy but i've never personally encountered that........

Why isn't this thing running? I've checked all my connectiong and everything is good. I've adjusted the cam angle sensor to every possible possition. and yes i had the fuel lines reversed, after if swapped them i turned the key and then took a spark plug out and there was fuel in the cylinder. I'm defently getting spark.... what else havent I checked???

[Carl H]

the lifters will def be flat if they were not submerged in oil while in storage...are your cams in sync?are the bores flooded?if the bores are flooded you'll have to let them air dry completely else it will not start.is your intake track complete with maf?

[smitty4130]

The lifters were not submerged in oil while in storage (about 3 months) so i guess there flat. am i screwed? how will this effect the car? also the bores are dry and the intake track is intact with maf.

[240daveTX]

the first time i tried to start mine it would fire but not start with the maf connected, unplugged the maf tried again started right up. then plugged the maf in and its been fine ever since. is you CAS set to the middle? is your engine properly grounded?

[cdorhout]

No, you're not screwed. The lifters are hydraulic, that means that they need to be full of oil to fill up the space between the cam and the valve. In a newly rebuilt motor it takes 10, 15, or 20 minutes of idling for them to pressure up and for the ticking to go away. The time it takes depends on how much oil restriction (if any) you put in the block during the rebuild.

[smitty4130]

Well I put everything back together and i still can't get it to start. I double checked all my grounds and everything appears to be ok. I put the crank angle sensor in the middle. I noticed that a red light comes on on the ecu. Its stays on solid and dosent go off till i turn the key off. I don't know if that means anything. I checked for spark and for fuel and i'm still good in that department. I just don't get why its not firing off. One thing i did think off is that the the oil pressure sensor isn't hooked up... would that make a differance?

Also back to the orignial post... where do those two little plugs go, i don't see any places for them???

I've included some pictures maybe you guys can see something i don't or point out something i'm not aware of.

The two plugs by the anti freeze out let... where do they go???This is the back side of one of those plugsThis is another oneAm I missing anything???

Thanks guys!
Modified by smitty4130 at 4:16 PM 5/5/2009

[240daveTX]

where are you grounds?

[Carl H]

you you're definately getting fuel into the chambers...at a loss here it should run...and on a side note some of that other wiring doesnt look right, like the 2 wire black plug with LARGE gauge wires connecting to a plug with smaller gauge wires...definately not home for that plug.

[smitty4130]

Well where should those wires go??? When you emailed me about jumping the starter inhibitor thats what i thought you meant... I'm confused.

[smitty4130]

Still not starting. I checked for spark again and fuel again.... I'm just not understanding why its not starting.

What should this be set on???
Modified by smitty4130 at 3:43 PM 5/6/2009

[smitty4130]

Figured it out. Timing belt tensioner failed or slipped or maybe i didn't install it right. one of the three. So the timing is way off and i'm assuming thats the why theres that loud tapping noise.

IS THIS AN INTERFERANCE MOTOR?

Just wondering if my valves have hit the pistons???

[240daveTX]

yes it is an interference motor

[vitaminD]

Figured it out. Timing belt tensioner failed or slipped or maybe i didn't install it right. one of the three. So the timing is way off and i'm assuming thats the why theres that loud tapping noise.

IS THIS AN INTERFERANCE MOTOR?

Just wondering if my valves have hit the pistons???

Sorry bro,The same thing happened to my rb20 3 weeks ago. ine was running great, I was pulling away from a stop and it died. I found that the timing belt idler bolt sheared off and timing jumped. And the long and short of it, all of my valves were now "c" shaped. I had been working on mine for 2 DAMN YEARS and this is what blows it up. compression check the motor my guess is that you will have a couple that read zero.

[smitty4130]

Well I fix the timing belt and put the crank and cams where they were supposed to be. The noise went away and compression checked good on all 6.

So heres the issue. I know i'm getting spark on all 6 plugs and i'm getting fuel on all six injectors. I did the all the trouble shooting steps in the manual for all the sensors associated with starting the motor and still nothing. Just curious because i've never actually heard a rb motor start, but how fast does the motor turn over before starting? My motor seems a bit sluggish, i'm guessing its turning at 400rpms. Also what sensors could cause the car not to start? I have the stock maf installed, if thats bad could that cause it not to start? (I have a q45 maf but didn't want to installed untill i could get it tuned).

Any input would be greatly appriciated because i'm stumped at this point. Thanks guys.

[sean8564]

Figured it out. Timing belt tensioner failed or slipped or maybe i didn't install it right. one of the three. So the timing is way off and i'm assuming thats the why theres that loud tapping noise.

IS THIS AN INTERFERANCE MOTOR?

Just wondering if my valves have hit the pistons???

I lost a Rb25 cause of the same thing it bent valves in 3 cyls. while driving

[smitty4130]

any advise????

[sean8564]

http://www.youtube.com/watch?v=IHbcQSF8gdc

[smitty4130]

Wow that video's pretty helpfull.... DOES ANYONE HAVE ANY ADVICE ON WHY THIS MOTOR ISN'T STARTING

[craz4240]

Wow that video's pretty helpfull.... DOES ANYONE HAVE ANY ADVICE ON WHY THIS MOTOR ISN'T STARTING

Well for one who did the wiring??

2 Are you sure on your lower harness you didn't bolt the alternator power wire to the starter and vise versa??? I have seen this before.

[Carl H]

I did the wiring on the car but if its getting fuel and spark then im at a loss as to why it isnt running...did the cas driving dog locating key beak off in the cas?

[smitty4130]

what is the cas driving dog locating key???

[sean8564]

the Half moon on the camshaft where the CAS sits check to make sure it is not broken it happened in the 180sx once
Modified by sean8564 at 10:51 PM 5/10/2009

[smitty4130]

That half moon piece isn't broken. I've taken it off several times including once to do the inspection the manual calls for. Also i'm pretty possitve that the lower harness isn't reveresed because it wouldn't turn over if it was.

Any other ideas????

[RustspecS13]

Did you pull off your fuel rail and make sure the injectors are firing? How are you checking that your getting fuel?

On my RB20 swap (s13) I can run the engine on starting fluid and I can hear my fuel pump priming, and run while cranking. Ergo my fuel injectors aren't firing.

~Alex