idle problems / fuel injector?
08-13-06, 01:47 PM
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idle problems / fuel injector?
ok, so my 88 rx7 will sometimes--when the engine's cold--crank but not idle.. that is, when it first starts, the rpm's do NOT jump to 3000 right off, but crank up to between 1 and 2k, and then fall immediately back to 0. usually this will happen one to three times until i get it to go ahead and start--usually by holding the accelerator. however, there seems to be a problem there (too? dunno if this is the same problem).. it seems to hesitate when pressing on the accelerator, like not enough gas is being delivered, and not steadily. when this happens, i can hold the pedal to the floor as i'm cranking and still only get the needle to bounce from like 250 rpm to 1500 or so and back, over and over until it either levels out or cuts off again. EVENTUALLY it idles, and i can get on the road.. but often if i don't wait long enough, it still won't idle--that is, as i'm pulling out of the driveway, and every time i hold the clutch or drop into neutral, it fails to idle at 750--and drops to 0 again. if i'm still in motion at this point of course, i can throw it into first or second and get it to come back on but usually i'd have been dropping into neutral for a stop sign or something anyway and so i can't keep giving it gas--and thus it dies. this is for several obvious reasons very inconvenient and pretty dangerous. once it's well warmed up and i've been driving for a little bit, it's usually fine, idles okay and such, at least most of the time. i still have some hesitation most of the time with the gas pedal--which i'm guessing may have something to do with the fuel injection system(?) but it's not as bad the rest of the time.
..help?
PS - also have a couple of electrical questions. hazard lights don't work and the fuse is fine. needs a new switch, i guess? and, a couple of weeks ago my tail lights and dash lights stopped working--the headlights still came on though. this i figured was a problem with the headlight switch.. before i could do anything about it (i.e. within a week) the tail and dash lights started working with the headlights again. just randomly one day, they came on again. no trouble with them since--should i take any precautionary measures against it happening again, or leave well enough alone, or what?
..help?
PS - also have a couple of electrical questions. hazard lights don't work and the fuse is fine. needs a new switch, i guess? and, a couple of weeks ago my tail lights and dash lights stopped working--the headlights still came on though. this i figured was a problem with the headlight switch.. before i could do anything about it (i.e. within a week) the tail and dash lights started working with the headlights again. just randomly one day, they came on again. no trouble with them since--should i take any precautionary measures against it happening again, or leave well enough alone, or what?
08-15-06, 04:22 PM
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..seperated..
ok, so my 88 rx7 will sometimes--when the engine's cold--crank but not idle.. that is, when it first starts, the rpm's do NOT jump to 3000 right off, but crank up to between 1 and 2k, and then fall immediately back to 0.
usually this will happen one to three times until i get it to go ahead and start--usually by holding the accelerator. however, there seems to be a problem there (too? dunno if this is the same problem).. it seems to hesitate when pressing on the accelerator, like not enough gas is being delivered, and not steadily.
when this happens, i can hold the pedal to the floor as i'm cranking and still only get the needle to bounce from like 250 rpm to 1500 or so and back, over and over until it either levels out or cuts off again. EVENTUALLY it idles, and i can get on the road.. but often if i don't wait long enough, it still won't idle--that is, as i'm pulling out of the driveway, and every time i hold the clutch or drop into neutral, it fails to idle at 750--and drops to 0 again.
if i'm still in motion at this point of course, i can throw it into first or second and get it to come back on but usually i'd have been dropping into neutral for a stop sign or something anyway and so i can't keep giving it gas--and thus it dies. this is for several obvious reasons very inconvenient and pretty dangerous.
once it's well warmed up and i've been driving for a little bit, it's usually fine, idles okay and such, at least most of the time. i still have some hesitation most of the time with the gas pedal--which i'm guessing may have something to do with the fuel injection system(?) but it's not as bad the rest of the time.
..help?
PS - also have a couple of electrical questions. hazard lights don't work and the fuse is fine. needs a new switch, i guess? and, a couple of weeks ago my tail lights and dash lights stopped working--the headlights still came on though. this i figured was a problem with the headlight switch..
before i could do anything about it (i.e. within a week) the tail and dash lights started working with the headlights again. just randomly one day, they came on again. no trouble with them since--should i take any precautionary measures against it happening again, or leave well enough alone, or what?
ok, so my 88 rx7 will sometimes--when the engine's cold--crank but not idle.. that is, when it first starts, the rpm's do NOT jump to 3000 right off, but crank up to between 1 and 2k, and then fall immediately back to 0.
usually this will happen one to three times until i get it to go ahead and start--usually by holding the accelerator. however, there seems to be a problem there (too? dunno if this is the same problem).. it seems to hesitate when pressing on the accelerator, like not enough gas is being delivered, and not steadily.
when this happens, i can hold the pedal to the floor as i'm cranking and still only get the needle to bounce from like 250 rpm to 1500 or so and back, over and over until it either levels out or cuts off again. EVENTUALLY it idles, and i can get on the road.. but often if i don't wait long enough, it still won't idle--that is, as i'm pulling out of the driveway, and every time i hold the clutch or drop into neutral, it fails to idle at 750--and drops to 0 again.
if i'm still in motion at this point of course, i can throw it into first or second and get it to come back on but usually i'd have been dropping into neutral for a stop sign or something anyway and so i can't keep giving it gas--and thus it dies. this is for several obvious reasons very inconvenient and pretty dangerous.
once it's well warmed up and i've been driving for a little bit, it's usually fine, idles okay and such, at least most of the time. i still have some hesitation most of the time with the gas pedal--which i'm guessing may have something to do with the fuel injection system(?) but it's not as bad the rest of the time.
..help?
PS - also have a couple of electrical questions. hazard lights don't work and the fuse is fine. needs a new switch, i guess? and, a couple of weeks ago my tail lights and dash lights stopped working--the headlights still came on though. this i figured was a problem with the headlight switch..
before i could do anything about it (i.e. within a week) the tail and dash lights started working with the headlights again. just randomly one day, they came on again. no trouble with them since--should i take any precautionary measures against it happening again, or leave well enough alone, or what?
Last edited by kefka; 08-15-06 at 04:28 PM.
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08-16-06, 06:11 PM
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HAILERS
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********PS - also have a couple of electrical questions. hazard lights don't work and the fuse is fine. needs a new switch, i guess? and, a couple of weeks ago my tail lights and dash lights stopped working--the headlights still came on though. this i figured was a problem with the headlight switch..*****************************
Could be the switch or the short harness that connects b/t that switch and the front harness. IF I had a problem like that I'd pull the plug off the switch and then jumper the wire that feeds the tail lights and the power wire for the tail lights.
That would be the White/Green wire for the power for the lights jumpered to the Red/Black wire in the plug. The lights should come on when you do that. If it did not come on, I'd check the White/Green for batt voltage.
It sounds like the short harness b/t the switch and the front harness MIGHT be bad or the switch. See this site for what the harness looks like. http://www.mazdatrix.com/86-92Electrical.htm
Could be the switch or the short harness that connects b/t that switch and the front harness. IF I had a problem like that I'd pull the plug off the switch and then jumper the wire that feeds the tail lights and the power wire for the tail lights.
That would be the White/Green wire for the power for the lights jumpered to the Red/Black wire in the plug. The lights should come on when you do that. If it did not come on, I'd check the White/Green for batt voltage.
It sounds like the short harness b/t the switch and the front harness MIGHT be bad or the switch. See this site for what the harness looks like. http://www.mazdatrix.com/86-92Electrical.htm
Last edited by HAILERS; 08-16-06 at 06:15 PM.
08-16-06, 10:06 PM
#9
Let's eat babies
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OH OH OH....dude.
I had almost the same problem in my Honda.
You need to check to see if you're over heating.
Mine would overheat without me noticing...because I never looked at my guages.
Once it over heated passed a certain point, It would just die if I threw it into idle...but then if I threw it back into first or second I could get it going again.....I hope that helped.
I had almost the same problem in my Honda.
You need to check to see if you're over heating.
Mine would overheat without me noticing...because I never looked at my guages.
Once it over heated passed a certain point, It would just die if I threw it into idle...but then if I threw it back into first or second I could get it going again.....I hope that helped.
08-16-06, 11:04 PM
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I just know that I tried to ignore it until I got my rex, it blew my water pump and.....lets just say I didn't give the car a hug or anything like that.
Yeah, see if you're overheating. AND check you're thermostat...that's what my problem was, it was just holding hot water on my engine...no circulation....no cooling.....just lots of bad words said to my honda which I donated to a church.
Yeah, see if you're overheating. AND check you're thermostat...that's what my problem was, it was just holding hot water on my engine...no circulation....no cooling.....just lots of bad words said to my honda which I donated to a church.
08-18-06, 12:09 PM
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i think there's maybe something wrong with the automatic choke?
i'm def. not overheating or anything like that.. once i'm warmed up in fact, it doesn't cut off really anymore. but for awhile it'll just cut off if i drop into idle without holding the accelerator and slowly letting off.. and even if i do that long enough to get it to idle, it might die when i hit the gas pedal. could my fuel injector have a problem?
i'm def. not overheating or anything like that.. once i'm warmed up in fact, it doesn't cut off really anymore. but for awhile it'll just cut off if i drop into idle without holding the accelerator and slowly letting off.. and even if i do that long enough to get it to idle, it might die when i hit the gas pedal. could my fuel injector have a problem?
08-22-06, 04:25 PM
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Originally Posted by kefka
i think there's maybe something wrong with the automatic choke?
i'm def. not overheating or anything like that.. once i'm warmed up in fact, it doesn't cut off really anymore. but for awhile it'll just cut off if i drop into idle without holding the accelerator and slowly letting off.. and even if i do that long enough to get it to idle, it might die when i hit the gas pedal. could my fuel injector have a problem?
i'm def. not overheating or anything like that.. once i'm warmed up in fact, it doesn't cut off really anymore. but for awhile it'll just cut off if i drop into idle without holding the accelerator and slowly letting off.. and even if i do that long enough to get it to idle, it might die when i hit the gas pedal. could my fuel injector have a problem?
08-26-06, 12:37 AM
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Check your intake for any leaks. When you have a vac leak and try and drive a car, it's lopes and hesitates like a driver who can't work a stick right. That and maybe clean out your injectors with some seafoam, there might be a problem with build up. Also recheck your spark, make sure plugs and everything are right, cap, rotar, plugs, wires.
But the intake leak is a sure bet.
But the intake leak is a sure bet.
08-26-06, 01:39 AM
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sorry 2 steal ur thread but my car has been pissing me off lately.. it doesnt start it stays cranking but it never turns on.. i have 2 hold down the gas pedal as if the car was carburated.. and then wen im driving it just begins 2 hesitate wen im in around 3-5th gear cuz i guess they go by slower and i set an idle speed on the gears.. wat do u guys think the problem might be? im pretty sure i gotta change the spark plugs but do u think there might be a problem with my injectors?
08-28-06, 09:34 AM
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Originally Posted by GT34
Check your intake for any leaks. When you have a vac leak and try and drive a car, it's lopes and hesitates like a driver who can't work a stick right. That and maybe clean out your injectors with some seafoam, there might be a problem with build up. Also recheck your spark, make sure plugs and everything are right, cap, rotar, plugs, wires.
But the intake leak is a sure bet.
But the intake leak is a sure bet.
i've used seafoam once, and fuel injector cleaners before, i don't think it's buildup.. in fact i feel like it's gotten much worse over time, i wouldn't be surprised if some of the rubber in the intake system was damaged further by those cleaners.. i don't know much of anything about the actual hands-on mechanical workings of cars, particularly this one though.. can you help me/offer some advice?
08-28-06, 09:57 AM
#21
Intake/vacuum leaks are usually caused by broken vacuum lines (rubber tubes everywhere in your engine bay). Check for broken or cracked ones. It can also be caused by bad gaskets. If you've never replaced them, I would suggest doing so.
There's some other areas they can come from, but I think those are the two major ones.
There's some other areas they can come from, but I think those are the two major ones.
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