please help, i hve no spark or fuel

[LER]

at first my car was running perfectly, but then as i posted before it started to run really bad, not reving and so on, so i unplug my MAF and it ran good up to 2500 but then cut off, i heard it ran on a preset fuel map if no MAF was detected, but when my MAF was plugged up it ran like crap i checked my grounds that came out of the harness into the engine bay, they were all connected, i even havea ground strap connected directly to my engine. I tried to make a better ground to my MAF, it wouldnt even try to start so i unplugged my MAF and tried it again, nothing, i checked my fuses and the eng, cont, fuese was blown. i replaced the fuse and still nothing from the engine, the fuse didnt blown again, hmmm any thoughts any one?

[Touchdown038]

If your car is running like crap while it's plugged in, chances are it's probably dirty. Have you ever cleaned it?

As for right now, try checking all your fuses just to get it to start again, then check out the MAF.

[LER]

all my fuses are fine, (atleast under the egine bay) and it still wont start with or witout the MAF

[ucfz31s13]

Is the car even getting spark? You mentioned in your prior post that it was hesitating and stumbling, now is it not even starting? You have two probs now or just the same hesitation? Need some more info..

lataz

z

[ucfz31s13]

Sorry, reread your posts...I got confused. Check the fuses inside the kick panel and see if any of them might relate to the prob. Can you hear the motor turning over, just no fuel or spark? Hard to tell if both fuel/spark are related w/o single-ing them out. Might just be coincedence on all of this. Find what PIN at the ECU for the spark and see if it's getting power. If not, check crank angle sensor. Being as though both fuel/spark went kaput at the same time, sounds like a fuse somewhere...

lataz

z

[Touchdown038]

For checking spark, why check the PIN at the ECU when you can just pull off each wire off the plug one at a time and check? It's a lot easier and faster than pulling all the crap out from in front of the ECU.

[ucfz31s13]

The problem might be deeper than that...The coil might not be getting power, or even took a ****. Aftermarket ignition stuff could complicate things even more. He mentioned he wasn't getting spark at the wires, so the problem needs to be narrowed down deeper.

lataz

z

[Touchdown038]

If the coil's not getting power, you're not gonna get a spark through the wire, just gives you a place to start instead of going straight to the ECU. Where did he mention he's not getting spark at the wires?

[ucfz31s13]

"please help, i hve no spark or fuel "...

-Thought he mentioned it, but I guess I'm assuming. Usually the most logical place as you mentioned...

[Touchdown038]

LOL... right in the title bar. Guess I have selective reading.

[LER]

ok my fuel pump isnt coming on i even took off the fuel line, im not getting any pressure, i took the wire off the coil to check for spark, i had nothing, all the fuses are fine, and im not sure which was the power wire for the coil but i put a volt meter in the double pronged plug and i received nothing, i hope this helps you guys, oh and is there a way to check my ecu?

[Touchdown038]

It might even be your battery, if you have nothing at all. Does it even crank over.

To check the coil wire, take off the wire going to the center of the distributor, put a spare plug on it, and ground it to the chassis. If you have any spark at all, the plug should start making lots of arcs of electricity.

[LER]

oh yea i forgot to tell ya, it turns over like a charm, and i said i checked the spark, its not firing, thanks for your help so far guys

[Touchdown038]

Alright, this has turned out to be a deeper problem than I can help with... as a last resort from me you could pull the ECU and check the error codes to see if anything comes up.

It's probably something with the ECU if you just pulled the MAF and now you have no fuel or spark, because as far as I know, the ECU controls both of those.

[LER]

how do you check the codes ? im completely lost on this part thanks again for you help

[Touchdown038]

There is a process on 240sx.org under the FAQ section.

[LER]

um the LED doesnt light up in my ecu, i connected it to an ohm meter and it conducts electricity but it doesnt light up, should i replace my LED before i try any thing else?

[U12 2NR]

check the fusible links under the hood.

[LER]

im sorry but im not sure what you're talking about...

[NISTECH]

i think the problem here lies way back when you tried to run a ground off your maf and you blew the fuse for the ecm. it is likely you grounded the wrong wire..and the ultimate result could be the fuse was not the only thing that blew when you grounded a power line out of the ecm. my bases for this is the fact the ecm wont go into self diag(the led doesn't light up) It always has power to the led but the gnd is what turns it on.

[U12 2NR]

the fusible links are the bigger fuses under the hood, check em and see. they're not relays.

[LER]

oh ya mean the big fuses, well one of those blew in the first place and those were the first i checked, but thanks anyways

so NISTECH, your saying i need a new ECU?

thanks for your help guys

[NISTECH]

Its a very good possibility. take the car to a shop that has either a snap-on scan tool or a nissan scanner. not sure on the yr of your car so it could be either a checker box or consult scanner. anyhow just have them pull codes for you..if you they cant get any codes out of it or if its a consult compatable model and it wont come up on either of the scan tools i would have to say yes you smoked the comp. basically what i am saying is if they go knockin on the door of the computer and no one answers. then no ones home in there.