in need of help

[e30construction]

ok so recently ive noticed that sometimes when im driving and i go to floor it itll get to about 4000 rpms and then start to stutter or mis..itll do it as long as im giving it all the gas but drives normal any other time..i can even floor it sometimes and it not do it..any suggestions on what it may be?and another clue is i can hear it missing through the exhaust and one time it made my car sound alot louder..oh and when i was doing my valve adjustment i seen where one of the black things(not sure what they are) right next to the rockers was bent a tad at the corner which was making it hit one of the rockers..wld that cause anything?

[jlevie]

The WOT throttle behavior is consistent with a fuel delivery problem or a bad WOT switch in the TPS.

[e30construction]

how can i diagnose this?

[jlevie]

Use a meter or a test light to check the TPS. To diagnose a fuel delivery problem tee a gauge into the rail supply line, zip tie it to a wiper or the cowl, and see what the pressure does when the problem occurs.

[e30construction]

i went and checked out all the ignition things on my car and i gotta say my wires are def old and need to b replaced..the part that connects to the coil is burnt up on the inside..cld this cause the issue?

[Danny]

No. There is no way a burnt up wire could cause an issue on a car.

[e30construction]

No. There is no way a burnt up wire could cause an issue on a car.

great sarcasim..anyway what i meant is could it cause the above mentioned problem

[jlevie]

No. There is no way a burnt up wire could cause an issue on a car.

Yeah, right...

Seriously, the car is now 24 years old. The ignition parts should have all been changed for the second time four years ago. But the odds are they are what was on the car when it was built.

Replace the wires, distributor cap, rotor and plugs (with NGK ZGR5A). But I suspect that isn't going to solve the problem. And while you are wrenching the car is way overdue for a complete cooling system replacement, overdue for a new O2 sensor, and due for new motor/trans/diff mounts as well as FCAB's, subframe & trailing arm bushings. I would not be surprised to find that it has the original shocks, which died about 90k ago.

E30's are great cars, but most have suffered benign neglect for a long time.

[e30construction]

oh ok well im gonna make up a list and go down it to start replacing things..i went ahead and ordered wires,cap,and rotor..also gonna post in the wanted thread for some of the other things i might can find a deal..as u might be able to tell im new to these cars and dont know much besides regular maintence..i do all my own work or atleast try..is there any other things that i should probly go ahead and replace while im at it?

[jlevie]

Most everything you will need to put the car is good running condition needs to be a BME OE or OEM part. Don't waste money on used parts.

[e30construction]

the things i might wld buy used is mainly the mounts and bushings if someone is sellin some they hardly used..went ahead and cleaned the cps up pretty good..also plan to change the tbelt,waterpump,tensioner,cam seal fan and fan clutch

[jlevie]

Mounts and bushings are on the list of new parts only.

[e30construction]

oh i figured someone might have a set of fairly new ones..i bought my motor mounts a while back used and they were in great shape..sadly i just havnt gotten around to installing them which needs it asap

[barbierij]

over 440k on the original coil and wires on the '89iX. I would suspect the fuel pump (clean the sock too), fuel filter, then throttle switch.

Does it happen if you push it to around 90% throttle?

[e30construction]

i havent rly went into testing it cus i dont like it lol..its usually just when i open it up a good bit..rly ive never completly put the pedal to the floor so if that tells u anything so basically 90 percent might b right im not 2 sure..ive been thinking of changing the filter here soon..and no means of checking the rail for pressure so idk..im hoping its nothing to serious like the fuel pump idk how id get that taken care of..how wld i go about cleaning the fuel pump..is there something i can put in the tank? i have no other issues with my car as far as i know