My e30 Keeps BUCKING! PLEASE HELP!

[bmxmett318]

Thanks all. From the tips and additional reading, the TPS and CPS are worth taking a further look at.

[IRON-E]

Tldr but it's your cps trust me.

im having the exact issue, ive done a tune of research with a close friend, coming to the conclusion that the crank position sensor is the issue, that controls timing....my car not only cuts out but it also back fires very bad...

Bro, it's a simple fix.

[custom e30]

short video of issues with my car...right after I shut off the video it started back firing very badly and kept dieing, crank position sensor will be here tomorrow, I hope it fixes it

https://www.youtube.com/watch?v=GBc1H-81DBY&feature=c4-overview&list=UUN4UkdvvgkWhiEqqXD9JcQw

[custom e30]

UPDATE...found a local bmw lover who has started his own website and ebay store, he did not have a crank position sensor listed so i messaged him and he had one left, it is used, i sent him a payment via paypal and 2 days later "today" i hooked it up to my car and now my car runs perfect, big thanks to the guy over at www.nsawerke.com check him out!!!

[IRON-E]

Told ya.

[custom e30]

didn't tell me, I had already ordered it bud, u where telling the guy that posted this thread, I was just backing up the theory

[Calypso Moor]

so today my car went from never bucking before to almost dying on the highway. CPS/TPS?

[Kershaw]

Is it just dying or bucking? Bucking is usually a loss of timing/spark. Dying is usually a loss of fuel.

[Calypso Moor]

Is it just dying or bucking? Bucking is usually a loss of timing/spark. Dying is usually a loss of fuel.

it'll drive fine for a then I start getting the momentary rpm drops, then it starts really dropping and I get what sounds like misfires in the engine. I replaced the CPS and TPS and it's still doing it. my car is undriveable because of how long and how low the rpm goes and stays. and then out of nowhere it just goes back to normal for a little while then it happens again.

[ForcedFirebird]

I have been finding a lot of sentiment in customer car fuel tanks as of late. One recently had so much, it was getting through the filter and clogging the screens on the injectors.

[diggity_1031]

I've been having the same problem in my 88. I noticed it would only do it after I hit the reflectors on the freeway while changing lanes. And then it would do it on the on ramp when I am getting up to speed. I changed my Ignition coil and it ran bitchin for a day. After the coil change and a day later it started misfiring bad. I ordered the CPS and changed it out, Now the car runs kind of better. There still is a very intermittent stumble that occurs 2 times in each drive. I am still trying to figure out what is causing it. I have the 153 dme and every time it bucks the CEL comes on but its only for a split second and then it runs smooth again.

[cervantes559]

This is what mine is doing car is running rich puffs out black smoke it was bucking when I was trying to get home

https://vimeo.com/153724265

https://vimeo.com/153724375

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