Start-Rev-Stall
06-10-07, 07:27 PM
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Start-Rev-Stall
Hey guys,
as the title says, I have been working on diagnosing this problem on my car for a while now, I would start it, it'd fire right up, rev to 2-3000, then stall promptly. If I held the throttle down at a steady rpm, it would run, but really crappy. Acceleration was allright, but then lots of backfire, and obviously, no idle AT ALL! So, sounds like vacuum leak right? Thats what I thought, then I check the bac, acv, maf, etc etc..Nothing fixes it. Well after taking apart my upper intake setup like 3 times, here's what it was,
On the primary fuel rail I pulled it off, and then pulled both injectors out. The rear rotor injector was fine, came out with the little piece of plastic bushing deal that slips around the injector to make it a tight fit in the injector hole. The front rotor injector I pull out, and that plastic bushing deal is gone?!? The wierd thing is, I just replaced all this stuff about a month ago, and I am POSITIVE i put on on there because there wasn't one on there when I replaced it originally. So it appears somehow these bushing things are getting broken and sucked through the engine somehow or something like this, has this happened to anyone? I replaced it today, and my car is finally running right after like 2 years of down time!! (project) Just never heard of anything like this so I was curious what you guys though, by the way i have an 86 GXl. Thanks!
as the title says, I have been working on diagnosing this problem on my car for a while now, I would start it, it'd fire right up, rev to 2-3000, then stall promptly. If I held the throttle down at a steady rpm, it would run, but really crappy. Acceleration was allright, but then lots of backfire, and obviously, no idle AT ALL! So, sounds like vacuum leak right? Thats what I thought, then I check the bac, acv, maf, etc etc..Nothing fixes it. Well after taking apart my upper intake setup like 3 times, here's what it was,
On the primary fuel rail I pulled it off, and then pulled both injectors out. The rear rotor injector was fine, came out with the little piece of plastic bushing deal that slips around the injector to make it a tight fit in the injector hole. The front rotor injector I pull out, and that plastic bushing deal is gone?!? The wierd thing is, I just replaced all this stuff about a month ago, and I am POSITIVE i put on on there because there wasn't one on there when I replaced it originally. So it appears somehow these bushing things are getting broken and sucked through the engine somehow or something like this, has this happened to anyone? I replaced it today, and my car is finally running right after like 2 years of down time!! (project) Just never heard of anything like this so I was curious what you guys though, by the way i have an 86 GXl. Thanks!
06-12-07, 09:45 AM
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i had the same problem, but i don't think it's from the injector bushing cover thing getting sucked in the motor. it would stall after start, but it runs good above 3k rpm, so I'm assuming it's not this. I don't know if it's the afm or the tps or what....
06-12-07, 03:14 PM
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Well if your car is running fine above around 3k rpm perhaps you have a problem with your primary injectors, clogged, something like that..My car ran like crap all the time unless it was wide open, any time I was in a steady state running condition though, it ran like crap, backfiring, no idle, etc. I just that something like this happening would seem next to impossible, but somehow it's happened twice to me.
06-12-07, 03:32 PM
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I SORT of have this problem. I have a GReddy eManage Blue installed on my FC, but when I'm at a constant RPM...my 13B sounds like it's missing. I've been told that "That's how rotaries sound"...but then why don't the RX-8s do it?
Also, I think your diagnosis of Tiger's situation might be right. My friend had the exact inverse. His secondaries were shitty so it ran like **** at anything over 1/4 throttle over 3k RPMs.
Your problem does remind me a lot of when I had a vacuum leak on my 240SX...my advice would be to buy a can of carburator cleaner and start spraying possible leaks...if your motor revs up at all, then there's a vacuum leak....at least I think this technique works on rotaries...lol.
Good luck man. Lemme know how it goes.
- Collin
Also, I think your diagnosis of Tiger's situation might be right. My friend had the exact inverse. His secondaries were shitty so it ran like **** at anything over 1/4 throttle over 3k RPMs.
Your problem does remind me a lot of when I had a vacuum leak on my 240SX...my advice would be to buy a can of carburator cleaner and start spraying possible leaks...if your motor revs up at all, then there's a vacuum leak....at least I think this technique works on rotaries...lol.
Good luck man. Lemme know how it goes.
- Collin
Last edited by collink; 06-12-07 at 03:33 PM. Reason: misnomer
06-12-07, 04:44 PM
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the thing is, I already know that that's the problem, I did the vacuum leak test, afm, bac, tps, etc tested everything.. I'm mostly curious if anyone else ever has had this problem..hows that emanage work for you? My roommate has one he said he'd let me try if I wanted, do you like it? But anyways, yeah, I just can't imagine how that injector grommet would actually fit down the injector port short of breaking into tiny pieces, which seems somewhat illogical..anyways, thanks!