my car still bucks uncontrollably under hard acceleration....mostly in 1st and 2nd , and 3rd sometimes if im really on it, but if i go very slow it will stop....this is really a problem because i can't go up hills from a stop......i have changed plugs, wires, 2 distributers,checked timing, fuel filter and finally brought it to a shop because i was very confused, they put it on the dignostic and checked fuel pump, fuel pressure, o2, injectors, vacuum and everything was fine...he pulled a code 11, which i checked was the crank angle sensor....which is why i changed the distributer, but it didnt help at all...i reground the crank A.S. and the MAF , no change, i am truly stumped and very frustrated..anyone have and idea what might be my problem???? ThanK YOU

Originally posted by YeloBlammo
my car still bucks uncontrollably under hard acceleration....mostly in 1st and 2nd , and 3rd sometimes if im really on it, but if i go very slow it will stop....this is really a problem because i can't go up hills from a stop......i have changed plugs, wires, 2 distributers,checked timing, fuel filter and finally brought it to a shop because i was very confused, they put it on the dignostic and checked fuel pump, fuel pressure, o2, injectors, vacuum and everything was fine...he pulled a code 11, which i checked was the crank angle sensor....which is why i changed the distributer, but it didnt help at all...i reground the crank A.S. and the MAF , no change, i am truly stumped and very frustrated..anyone have and idea what might be my problem???? ThanK YOU

Check your throttle position sensor and MAF to see if they are operating within specs.

Steve

Maybe your mounts have gone soft.

i believe i have checked the tps and maf voltages and they seemed to be where they're supposed to be, ill check again just for good measure, but i dont think its that, and as for mounts, i filled mine with the shore 93 urethane, and my car ran fine for weeks after before this started happening, does it help if i mention i smell gas sometimes, but i checked my plugs and they look perfect, im stumped....anyone?

Originally posted by YeloBlammo
i believe i have checked the tps and maf voltages and they seemed to be where they're supposed to be, ill check again just for good measure, but i dont think its that, and as for mounts, i filled mine with the shore 93 urethane, and my car ran fine for weeks after before this started happening, does it help if i mention i smell gas sometimes, but i checked my plugs and they look perfect, im stumped....anyone?

Could it be some sort of vapor lock? maybe check the charcoal canister operation and vacuum line connections. Also, there is a check valve back by the gas tank. Don't know if any of those things might be the cause.

Steve

i have the exact same problem with my nx and i have the gas smell as well when i first get in my car in the morning like its beenleaking or something. and is the cranck angle sensor the one that is connected underneath the battery tray?? bcuz ive heard of a few ppl that had that connector slip out.
some thing to look into

Originally posted by Fonque
i have the exact same problem with my nx and i have the gas smell as well when i first get in my car in the morning like its beenleaking or something. and is the cranck angle sensor the one that is connected underneath the battery tray?? bcuz ive heard of a few ppl that had that connector slip out.
some thing to look into

As for the gas smells. I used to get that before I changed all my injector seals. It actually smelled like naturtal gas. I even changed the FPR seal.

pretty white....you say your injector seals were leaking, did your car buck before you fixed that??, doesnt seem to me that would be the problem but if that fixed it for you i'ld try it, the crank angle sensor is the sensor on the distributer, thats why i changed it 2ce but still did it, i dont think its the charcoal can because we checked vacumm and that was fine, ill have to look into that check vavle you were talking about, i dont know what that is.......arrrrrrg!??!:confused: :confused: :confused:

Hmmm....Did u try cleaning ur egr stuff?? I had some bucking problems under 3k and i plugged up the egr and bpt stuff and it stopped. Also, did u check ur cat?? Its possible the cat is clogged. Its a longshot though. Have u done a compression check?? how about your throttle body?? have u cleaned it at all?? Well, hope u can pinpoing the problem. Lastly, you might want to try using some Redline Sl-1 fuel system cleaner. Its said to be the only additive that is safe to use on our cars and can make a difference as well.

Had the same problem for the longest time until i replaced my plug wires. either that, or I also disabled my egr when my car was doing that.

It sounds a bit like the ignition HT coil is producing a weak spark that gets snuffed out under compression as a higher voltage is needed to jump the gap when the compression is high. Try reducing your plug gaps to half the usual gap temporarily to see if it helps.

what would help to get the spark back?? like what would need replacing? since you are not the first person i ahve heard that from.

Most likely the ignition coil or the transistor that switches it. Reducing the plug gap temporarily though should tell you whether it's weak or not.

ive changed the plugs already and it didnt change anything, and i ran the car off the downpipe and it didnt help, so its not the cat,and its not the egr since i dont have it, i checked the ignition secondary resistance like it says in the fsm and that was ok, but i couldnt get the primary reisitance, that might be the problem since you mentioned it may be the ignition coil? i havent changed the gap on my plugs yet but ill double check on the primary resistance just to make sure.....thanks for the help guys, anyone else have this problem?

i checked the primary and secondary resistance on the ignition coil, and one read 13.3k ohm (which the book said should be 13k) and the other was 1.3 ohm(book=.9) ..now i know theyre not exact but they are pretty damn close, does anyone think this that off to cause the problem??...also, it said to check the primary to case reisitance, what exactly is the case?.thanks...scott

The primary and secondary resistances rarely tell you if an HT coil is weak, you would have to measure the inductance compared to a good one to tell - and even that method isn't foolproof.

so definately close the gap on the plugs before i go buy another one?, and see if it helps, but would that explain the gas smell sometimes?..my plugs look excellent and my engine runs fine otherwise, highways are no problem, its just starting off and hills that kill me...thanks

Yes, if closing the plug gap makes no difference then your problem is very unlikely to be a weak spark.

what exactly would i set the gap at?

Car still bucking.

Have you tried loosening the harness on the saddle? The belts could be cutting into the underbelly and causing it to be a little pissed off.

Also, make sure there are no thorns or anything in the hooves err I meant tires. Could be pissing it off too.

:D