Engine Dies giving gas from Idle
07-16-05, 06:02 PM
#1
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Engine Dies giving gas from Idle
Ok, before you get mad because there is a thousand threads for this, I know. I read them all (or most of them) and none are quite the same as this. Here goes I'm going to give quite a bit of detail to hopefully make it easier.
The car idles well, but dies or comes close to dying any time you give it gas (even less than 1/4inch of throt). I cant go over 3k since its a fresh rebuild. Same result with pretty much any throt imput from nothing to full. the engine will either die or come close before reving up.
I just rebuild my engine, RB med streetport w/ mazdatrix exhaust port and turbo exhaust inserts. Full RB road race exhaust. Intake, SAFC installed but not tuned at all. its an s4 (88) gx. All emissions removed and block off plates used. Only part not blocked off is the BAC.
I have ruled out the following:
1. New fuel lines
2. Injectors were cleaned and balaced.
3. Checked grounds
4. tried the ecu from an 87, same problem. (the number on it was 326, mine is 327). It was on a working car less than a year ago.
5. Checked TPS and tried another TPS for flatspots and found none.
6. Getting no codes from the engine.
7. Tried unplugging the SAFC, same result.
8. Tested TPS wires at ecu, they were ok.
9. Timing is dead on checked from both leading and trailing.
10. Fuel pump was replaced with a turbo pump. the old assembly broke so I upgraded the whole thing since i intend to go turbo. the FPR should take care of the extra fuel as I understand.
11. I know its getting spark since its idling.
12. new plugs.
13. Checked MANY times for vac leaks.
14. tried with BAC connected and disconnected with same result.
15. Set the TPS
Things I could try:?
1. extra grounds?
2. the exact ecu.
3. new afm? it seems fine but I dont know any way of being sure.
4. the SAFC was set for zero correction before, make sure soemthing isnt set improperly?
Although it seems like a fuel delivery problem I find it hard to belive unless its the ecu or something.
Any ideas? I have been replacing evertyhing on this car, giving its lots of love. and I want to get it on the road and get the engine broken in. Any imput would be greatly appreciated. Thats all I cant remember for now, I will add more if I can think of anything. any other questions please ask. Sorry to those I am going to **** off for seeing the same type of post again.
Dave
The car idles well, but dies or comes close to dying any time you give it gas (even less than 1/4inch of throt). I cant go over 3k since its a fresh rebuild. Same result with pretty much any throt imput from nothing to full. the engine will either die or come close before reving up.
I just rebuild my engine, RB med streetport w/ mazdatrix exhaust port and turbo exhaust inserts. Full RB road race exhaust. Intake, SAFC installed but not tuned at all. its an s4 (88) gx. All emissions removed and block off plates used. Only part not blocked off is the BAC.
I have ruled out the following:
1. New fuel lines
2. Injectors were cleaned and balaced.
3. Checked grounds
4. tried the ecu from an 87, same problem. (the number on it was 326, mine is 327). It was on a working car less than a year ago.
5. Checked TPS and tried another TPS for flatspots and found none.
6. Getting no codes from the engine.
7. Tried unplugging the SAFC, same result.
8. Tested TPS wires at ecu, they were ok.
9. Timing is dead on checked from both leading and trailing.
10. Fuel pump was replaced with a turbo pump. the old assembly broke so I upgraded the whole thing since i intend to go turbo. the FPR should take care of the extra fuel as I understand.
11. I know its getting spark since its idling.
12. new plugs.
13. Checked MANY times for vac leaks.
14. tried with BAC connected and disconnected with same result.
15. Set the TPS
Things I could try:?
1. extra grounds?
2. the exact ecu.
3. new afm? it seems fine but I dont know any way of being sure.
4. the SAFC was set for zero correction before, make sure soemthing isnt set improperly?
Although it seems like a fuel delivery problem I find it hard to belive unless its the ecu or something.
Any ideas? I have been replacing evertyhing on this car, giving its lots of love. and I want to get it on the road and get the engine broken in. Any imput would be greatly appreciated. Thats all I cant remember for now, I will add more if I can think of anything. any other questions please ask. Sorry to those I am going to **** off for seeing the same type of post again.
Dave
Last edited by rx_prez; 07-16-05 at 06:05 PM.
07-16-05, 06:17 PM
#2
double check your fuel pressure, not just at idle but when this dying out condition comes on.
sounds like a fuel pressure problem.
and don't say "i put a brand new pump on it...", we are human and we make mistakes no matter how much we dislike it.
if your pressure is good then it is likely an injection issue like a faulty or unplugged AFM or a faulty sensor somewhere.
sounds like a fuel pressure problem.
and don't say "i put a brand new pump on it...", we are human and we make mistakes no matter how much we dislike it.
if your pressure is good then it is likely an injection issue like a faulty or unplugged AFM or a faulty sensor somewhere.
08-31-05, 06:32 PM
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I tried the fuel pressure guage and it reads between 34-36, then immediately jumps up to 40-41 psi when you touch the throttle at all.
1. New O2 sensor
2. Thired a third TPS
3. Tried a stock by with everything on it. thinking that maybe between the ported engine/exhaust and sleeves and the ported tb it was simply not getting enough gas fast enough on stock maps. This made everything even worse.
4. Took off the bac and blocked it off.
5. Removed SAFC totally and tried the initializing it quite a few times.
6. Replaced the original N/a fuel Pump.
7. spark plugs have fouled twice so far (as in I just installed my third set of plugs today in under 500kms and idling when trying to tune). i try not to idle the car as much as I can.
8. Ecu is sending signal to the injectors.
9. got some more used injectors and fuel rails of ebay. installed them and the fpr and pulsation dampner.... nothing.
10. battery is relocated.. so I tried moving it back to the front and connecting it, same result. nothing.
11. grounded engine again with a 4 guage, ran a wire directly to the alternator. and made a solid ground connection 1 foot from the battery. Intending on doing all the ground connections as detailed on rotary resurrection.
12. Tried restabbing the cas since even the though timing was on it seemed to be at an extreme. i thought maybe it wasnt advancing quick enough. nothing.
13. intalled a air/fuel guage. gives the same reading as the wideband. it goes very lean when you step on the gas. i think it really says that just because the fuel flows through but is not conbusted so it ends up with a lot of O2 when going by the sensor... meaning im pretty sire there is fuel as everything point to it.. and it backfires after.
14. tried a different afm.
15. tried a pressure sensor of a stock and working 88.
16. there is more things but i cant think or now, i will add them when they come to me.
17. hooked up a vaccuum guage to see how things where and everything seemed fine. was reading about -10 at idle of 700-800.
18. compression tested and read about 82 on all faces, engine has just over 500km (300mi).
Still no ecu codes.
I think that whatever it is has soemthing to do with the plugs fouling so often. could it possible be the coil packs? it seems to be some kind of ignition issue. I just dont want to go out and buy new ones if i dont have to, ive already bought too many things i didnt need thinking it might be that.
HELP!! the season is winding down and i want to be able to drive for at least a month.
only things i can think of to try are: coil packs, new wires (the ones i have are not very old), the rest of the grounds as detailed in rotary resurrection.
1. New O2 sensor
2. Thired a third TPS
3. Tried a stock by with everything on it. thinking that maybe between the ported engine/exhaust and sleeves and the ported tb it was simply not getting enough gas fast enough on stock maps. This made everything even worse.
4. Took off the bac and blocked it off.
5. Removed SAFC totally and tried the initializing it quite a few times.
6. Replaced the original N/a fuel Pump.
7. spark plugs have fouled twice so far (as in I just installed my third set of plugs today in under 500kms and idling when trying to tune). i try not to idle the car as much as I can.
8. Ecu is sending signal to the injectors.
9. got some more used injectors and fuel rails of ebay. installed them and the fpr and pulsation dampner.... nothing.
10. battery is relocated.. so I tried moving it back to the front and connecting it, same result. nothing.
11. grounded engine again with a 4 guage, ran a wire directly to the alternator. and made a solid ground connection 1 foot from the battery. Intending on doing all the ground connections as detailed on rotary resurrection.
12. Tried restabbing the cas since even the though timing was on it seemed to be at an extreme. i thought maybe it wasnt advancing quick enough. nothing.
13. intalled a air/fuel guage. gives the same reading as the wideband. it goes very lean when you step on the gas. i think it really says that just because the fuel flows through but is not conbusted so it ends up with a lot of O2 when going by the sensor... meaning im pretty sire there is fuel as everything point to it.. and it backfires after.
14. tried a different afm.
15. tried a pressure sensor of a stock and working 88.
16. there is more things but i cant think or now, i will add them when they come to me.
17. hooked up a vaccuum guage to see how things where and everything seemed fine. was reading about -10 at idle of 700-800.
18. compression tested and read about 82 on all faces, engine has just over 500km (300mi).
Still no ecu codes.
I think that whatever it is has soemthing to do with the plugs fouling so often. could it possible be the coil packs? it seems to be some kind of ignition issue. I just dont want to go out and buy new ones if i dont have to, ive already bought too many things i didnt need thinking it might be that.
HELP!! the season is winding down and i want to be able to drive for at least a month.
only things i can think of to try are: coil packs, new wires (the ones i have are not very old), the rest of the grounds as detailed in rotary resurrection.
Last edited by rx_prez; 08-31-05 at 06:43 PM.
01-24-07, 09:58 AM
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I see the thread is a little old, but back in 2001 I had the same freakin' problems on my '87 TII. Exactly the same! I also tried everything he did with no luck. I ended up giving my motor to a friend and I became the guy with the LS1 RX-7. Car has run great ever since!
As of today, that old motor is still sitting in the corner of his garage in "time out".
I wonder if Dave ever got his fixed? I'd love to know what it ended up being.
As of today, that old motor is still sitting in the corner of his garage in "time out".
I wonder if Dave ever got his fixed? I'd love to know what it ended up being.
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03-02-23, 07:39 PM
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The curse is back
Does anyone has some more knowledge on this.
Having the same issue tried everything on this list and more! could it really be wiring/ecu?
Driving me crazies might just have to go stand alone, I'm too broke for that s*** though!
Having the same issue tried everything on this list and more! could it really be wiring/ecu?
Driving me crazies might just have to go stand alone, I'm too broke for that s*** though!
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