no spark and no fuel
12-05-09, 12:07 AM
#1
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no spark and no fuel
hey guys i have a slight prob here, i got a 88 s4 that wont start, had it for about a month drove it to my friends dads shop to do some body work, prob sat for about 2months, it was started up about 4 times within those two months, now it wont start, when it did start it was really slow like a dead battery, so got a battery, it helped alittle, still cranked over slowley, now it wont even start ive checked spark nothing ive checked fuel nothing, check all the fuses nothing is there any major really that would cause this ive searched and have got nothing help me
12-05-09, 10:35 AM
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Are you absolutely sure it just isn't flooded? You just described an exact recipe for a flooded RX-7. 
If you aren't getting fuel and spark on a NEW and CHARGED battery, then check for 12V at the black/yellow wire at the leading or trailing ignition coil when the key is set to RUN. If you don't have 12V, check the main relay and the EGI fuse.
Also, what is the condition of the battery cables and clamps?
If you aren't getting fuel and spark on a NEW and CHARGED battery, then check for 12V at the black/yellow wire at the leading or trailing ignition coil when the key is set to RUN. If you don't have 12V, check the main relay and the EGI fuse.
Also, what is the condition of the battery cables and clamps?
12-05-09, 12:26 PM
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already tryied deflodding it, pulled the plug out and there was no gas on it what so ever, i dont hear the fuel pump turn on when the key is on and i check both battery cables and egi fuse and they are good to go, not sure whats going on
12-06-09, 10:17 AM
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The fuel pump should not run when you turn on the key. It will only run while the car is cranking.
Check for 12V at the main EFI relay when the key is set to RUN.
Check for 12V at the main EFI relay when the key is set to RUN.
12-06-09, 05:17 PM
#5
Check that and the 7.5 amp fuse on the driver side kick panel fuse the hump thats sticking out mine blew after driving to the store on the way home and I was stuck for an hour and a half tryin to figure out why there was no spark or fuel and that ended up being the problem...
12-17-09, 12:50 AM
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hey guys im still havin no luck is there any way i can check is my ecu is getting power and check to see if my main relay is bad and help is very appreciated and need to be driving
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12-17-09, 12:57 PM
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i have checked all the fuses and made sure that i have power to them, the main thing that i have done is that the main ground wasnt even attached to the engine so i attached that walla turn over like a good engine lol, check all the ground under intake behind the engine on the engine behind the coil pack, checked all plugs and connectors made sure they were all pluged in. I just got the pin outs of the ecu so im gonna check to make sure i have good ground at the ecu and that i have power getting to it i will let you guys now how it goes
12-18-09, 01:15 PM
#9
OK after the fuse thing, I was lost I was also told that night when my fuse blew to check the CAS (Crank Angle Sensor) to make sure it was spinning sorry I havent checked on your thread to give you that I hope it is just a ground problem and you find it we need more of these beautiful cars on the road!!!
VIVA RX-7's!!! LOL
VIVA RX-7's!!! LOL
12-19-09, 10:27 AM
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yea sorry i type what im thinking and dont really look it over, sorry about that, yea im gonna check all the grounds at the ecu, so far lookin at the wiring diagram i see 4 grounds. Im also gonna check to make sure the ecu has voltage input. Is there any easy way to check my main relay to tell if its good or bad, thanks for all the help guys even though most of the time i dont make sense ha ha
12-20-09, 01:30 AM
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All right so i sorta have a update, check all the ground and voltage going to the ecu, came out good all the grounds were grounded, the battery wire, main relay, and i think it was two other power wires all had 12v. So im really confused, so i decide just for the hell of it took the ecu and took the front cover off. no prob all the solder (cant remember how to spell right now) points look perfect, flipped it over, opened the other side up and 4 solder points are black and you can deff tell they have been burnt. ended up getting another s4 na ecu, tried starting it up, still getting no spark. Is there any way i can check to see if my main relay is bad, all your guys help is very appricated
but if that is the problem you know what it is then clean the old ecu with an eraser like we use to do with the slot cars test it and if it's good sell it LOL I know I would!!!
12-20-09, 10:57 AM
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So have you checked for 12V at the main EFI relay? The easiest way to do this is to unplug the trailing/leading coil and check for 12V at the black/yellow wire with the key set to RUN.
12-20-09, 01:16 PM
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I'm having a simalar issue with my 88 s4. except I have no spark on th trailing coil. The leading coil is firing. I haven't checked fuel currently.
I have a Crank angle sensor voltage as the engine is cranking. Ive back probed to the pcm and found i have no power leaving the pcm ( Or ecm in this case. lol.) I'm trying to see what other inputs the ecm needs to control spark to the trailing coils. I'm almost wanting to swap my ecm from my donar car to see if it helps. As for your problem, i'd actaully have to look at the car. No fuel and no spark sounds like you have abreak in the crank positioning sensor. But, that is just a really out there guess. Without diaganosing it I cant promise anything.
I have a Crank angle sensor voltage as the engine is cranking. Ive back probed to the pcm and found i have no power leaving the pcm ( Or ecm in this case. lol.) I'm trying to see what other inputs the ecm needs to control spark to the trailing coils. I'm almost wanting to swap my ecm from my donar car to see if it helps. As for your problem, i'd actaully have to look at the car. No fuel and no spark sounds like you have abreak in the crank positioning sensor. But, that is just a really out there guess. Without diaganosing it I cant promise anything.
12-20-09, 05:33 PM
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finally got to the shop, first thing ive done is turned the ingition on and check for 12v at each black/yellow wire at the coils they are good have 12v, went back down to the ecu just to double check over everthing. looked at the pinout for what wires going to the coil, on the big plug top row second one in terminals 1u is the coil with ingiter (trailing) IGs-T (select signal), according to all data this wire with ignition on should have approx. 4.4v mine has no volts what so ever. Im looking at alldata trying to to find were this wire goes (all data sucks for this stuff) does anyone happen to now what this wire goes to any help is appriciated
12-20-09, 05:34 PM
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12-24-09, 11:01 AM
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Ok, I go tmy car running. Smokes like a ****, may be because of all the cranking it was goingunder with no fuel, or spark. I was digging around by the fuel pump harness rechecking my basics, found nothing coming out of the pump while the car engine was being cranked ( The fuel pump only receives power when the crank signal is being sent). Tugged ona few things and power. Fuel started pouring out. Ok, so now back to my main issue. I have fuel, the engine starts and runs now. It runs liek crap though. lol. I have no tach, and still no spark on the trailing side coil. So now i'm back to sqaure one.
01-19-10, 09:00 PM
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hey i have a question about the neutral switch on the transmission if that is disconnect can that cause a now spark, ive been thumb through all data to see if anything could be the root of my prob thanks for all the help guys
01-19-10, 09:39 PM
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Ok, I go tmy car running. Smokes like a ****, may be because of all the cranking it was goingunder with no fuel, or spark. I was digging around by the fuel pump harness rechecking my basics, found nothing coming out of the pump while the car engine was being cranked ( The fuel pump only receives power when the crank signal is being sent). Tugged ona few things and power. Fuel started pouring out. Ok, so now back to my main issue. I have fuel, the engine starts and runs now. It runs liek crap though. lol. I have no tach, and still no spark on the trailing side coil. So now i'm back to sqaure one.