Back story: Bought just the shell 1993 usdm manual rx7 (previous owner had an ls1 in it). there was no engine harness included, it was a roller. i bought a swap out of another car off a friend and the engine had caught fire. i replaced all the burnt stuff including the wiring harness.

now current issue: i still have not got the car running. is it possible the knock sensor is preventing spark and fuel? i tested the knock sensor and it doesnt seem to be working. im really getting fed up someone please help me get this car running!!!!

 

update: check fuel pump by jumping the ground and F/P in the diagnostic port. the fuel pump turned on i could here it whining. Could anyone tell me what that means exactly?

 

You would need a guage to tell if the system is filling up the fuel circuits. Or take off the supply line and run it into a gas can. Safety first here!

If its gettin gas, plugs are good, and your ignition system is good then I would try to pull start it. You might be suprised. It is possible it just wont start using crank w/the key. If it has gas/spark/air it should start when you pull just dont use crank. After it starts let it warm up, if you can, and then it will probably start w/the key.

I learned years ago to treat my R1 like a 2-stroke dirt bike, it works.

Good luck.

 

i don't have fuel or spark that's the problem. unless I jump the diagnostic points the fuel pump doesn't prime when I turn the key to on like it should. also don't have spark but it cranks over and I have a brand new yellow top

 

If your positive there is no gas & no spark using the key....

Fuel pump gets ist 12vdc from fuel pump relay, White w/Red stripe.
Power into fuel pump relay is Blue w/Red stripe. The other two are +/- to energize the coil. The 15amp engine fuse powers the + wire at the fuel pump relay for the coil so it has to be good as well as the 20amp fuel pump fuse.

Are you positive that the fuel pump doesnt run w/the key? I hate to ask you again but it is important because you have alot to trouble-shoot if not. I have the OEM wiring schematic and am willing to help. Hit me back when you can.

Is the CIRCUIT OPENING RELAY CLICKING?

 

so did you check the fuses?

 

yes its a very obvious whining sound when the pump turns on (will only come on when the diagnostic port is jumped). i can only get to my car on the weekends but i will make sure to check all the wires for voltage and i really appreciate the help. Oh and all the fuses are good.

 

Make sure the map sensor is plugged in too although I'm sure you wont get that lucky.

 

crank sensor controls fuel and spark, i had same problem on mine... i would check that first, hope that helps you out.

 

Is the RPM gauge bouncing when you crank the car over?

thewird

 

i thought about that. does anyone have a picture of the crank sensor i could look at? Im am fairly certain the map sensor is plugged in ill double check though couldnt hurt. Im not sure about the rpms bouncing im going to do my best to get up to where my car is on Thursday to check over all this stuff. I really appreciate all the help everyone i just want this baby to run!

 

nvm about the picture i located one

 

Water Thermosensor can prevent car from starting when cold if bad or wiring bad.

I am still curious, how did you trouble-shoot the no spark issue?

These are probably not your problem but some other things that may prevent the car from starting are:

I would check the crank angle sensor connectors & make sure they are cool. Also, the wiring. Crank angle sensor connectors are on engine harness which if you follow will plug into main harness, check connector (pins/wires) here too.

I have seen the MAIN RELAY cause a problem similar to yours, crank ok but will not start & can run pump w/diag. jumper.

I doubt it is the connectors on the ECU because if you can jump the pump the fuel pump relay must be ok and that sorta eliminates ECU plugs, although a poor connection at ECU can create a cranks ok but no start problem.

Also, I would like to actually see gas coming out of the line or pressure on a guage. Just cause pumps running (or sounds like it) doesnt automatically fuel delivery is good.

 

i have not done much diagnosing on the spark just know that it doesnt get any. im going to try and get to my car tonight but we are having a snow storm right now and it depends how bad the roads are. ill post tonight on what i find out if i make it up there. Thanks again for all the suggestions

 

alright great news im getting a very healthy spark and im fairly certain the fuel pump turns on now as i could smell the fuel when trying to turn over. My tach isnt bouncing when i try to start it either. im a dumbass and didnt plug in the crank angle sensors they got pushed aside some how. I wasnt able to get everything hooked back up to try and actually see if the car runs. i will try to get back to work on it monday night. ill update after that thanks again

 

Any stored PCME fault codes? (Pages F-18++ in 1994 FWM)

 

i do not own a SST is there another way? can i use an obd diagnosis device

 

You don't need one. See this thread.

 

update: i put a little marvel mystery oil in the top two spark plug holes to lubricate the inside and cranked it, since it had been sitting for awhile. Got everything hooked back up but its still not starting. it sounds pretty healthy when cranking but one of my grounds got very hot, so i will run more grounds and see if that helps. thanks for the thread wstrohm i will see if i cant check over all the codes next time i can make it up

 

Have you got your tach bouncing yet? Unless its bouncing, neither fuel, nor spark is being provided since the computer isn't seeing RPM. Putting oil in the spark plug holes isn't going to make an engine start if theres no fuel or spark.

Did you connect the CAS sensors correctly? If you put them backwards, it won't work.

thewird

 

Just as an FYI, having the connectors backwards will not keep the car from starting. The car will not drive well at all, but it will start and idle with the CAS connectors reversed.

 

sorry forgot to mention ya the tach does bounce now. not very much though it only jumps a few hundred rpms