View Full Version : can't fix this

nissan lover
07-21-2006, 12:35 AM
I'm having a very bad bucking/missfire prob on my car. hg's are new, resealed all intercooler pipes, new plugs and wires, no codes, no lights. when i put the gennisis tool on it bank 1 o2 sensor voltage was .02 constantly. o2 voltage should never be this low and should allways have cross counts. replaced the sensor, didn't help. i'm tired of replacing parts.

nissan lover
07-21-2006, 10:48 AM
almost forgot, when you give the car gas the o2 will see as many as .82 volts.

07-21-2006, 11:41 AM
Without knowing much more, it sounds like your DIS is shot. Bad bucking usually equals a bad DIS module. That affects the ignition, so your O2s would be off because of raw fuel possible being exhausted...

07-21-2006, 01:56 PM
Sounds like a bad vacuum leak. Or In the Ford book i think they misprinted the plug wire spots on the coil, two were switched. i fell for that one when i did my gaskets.
Good luck

07-21-2006, 02:40 PM
From the front, coil pack should read:

4 6 5
3 2 1

07-21-2006, 04:17 PM
My vote goes to the DIS module also.

07-21-2006, 04:27 PM
I second the wire order problem, since the motor sounds freshly re-assembled.

Usually a bad dis will throw a code, whereas an unplugged or misplaced wire will not.

07-21-2006, 07:00 PM
I second the wire order problem, since the motor sounds freshly re-assembled.

Usually a bad dis will throw a code, whereas an unplugged or misplaced wire will not.

An unplugged or misplaced wire won't cause sever bucking though...I've been through both. The dis gives a definate bucking under any acceleration or just driving...wires crossed you have a hard time keeping the engine running period, let a lone driving. And usually it's just a dog then too, but no bucking.

My DIS didn't throw any codes when it went...

nissan lover
07-22-2006, 04:09 AM
i know 4 a fact that the wires are not in in the wrong order.

nissan lover
07-22-2006, 04:12 AM
is there any way of having the coil pack tested.

07-22-2006, 10:22 AM
The coil pack is set up in pairs. There are 2 cylinders per coil, 3 coils. So if the coil pack goes bad, you'd loose two cylinders at the time. Unplug a row of wires, (4&3, 6&2 or 5&1) and see if it changes the way it runs. You can also check plug wires at plugs to see if they are getting spark. And if you feel like pulling the coil pack off, I think Autozone can test them.

07-22-2006, 11:11 AM
is there any way of having the coil pack tested.

Keep in mind that although coils can go bad, it is much more common for the DIS to go bad than the coil. And the DIS controls the coil...

07-22-2006, 11:13 AM
Autozone can check your DIS too. ;)

nissan lover
07-22-2006, 10:35 PM
by the dis what do you mean? the cam sensor, crank sensor? cam sensor is new.

07-23-2006, 12:32 AM
the DIS is located right by your A/C compressor it says MOTORCRAFT DIS right on it:D :p


07-23-2006, 09:11 AM
This is your DIS.

07-23-2006, 11:29 AM
I am kinda leaning towards the big vacume leak theory. Spray carb cleaner sparingly around the gasket surfaces and vacume connections on the the #1 cylinder side of the engine. when you find the leak the engine speed will increase, and the o2 reading will go up. Be sure to have a fire extinguisher there because this kind of testing is very flamable. proceed at your own risk. If you have a leaky sparkplug wire you will have a lovely bonfire. If you don't have a fire extinguisher just take hot dogs.

Scott Long
07-23-2006, 12:22 PM
On a 94 5-speed the DIS module will be located on the front side of the passenger fender. 89-93 DIS modules are on the accessory bracket behind the compressor.

They changed in 94.

07-23-2006, 12:34 PM
I have a slight shudder on hard acceleration as well.

I plan to replace the DIS soon and the rear shocks have to go. (one has a blown seal)

Scott Long
07-23-2006, 01:00 PM
Slight shudder as in the driveline or in the motor?

nissan lover
07-23-2006, 02:31 PM
thanks scott i was having a real hard time finding that.

nissan lover
07-23-2006, 04:30 PM
well the good and bad is that neither autozone or advance can test the modual but my friend has an ossiloscope. i'll put the car on that to look at firing voltage and spark duration and get back to u guys. thanks for your help.

07-23-2006, 04:42 PM

It says on their web site they can test them. Maybe that was a lie or maybe the guys at your local store don't know what they are doing. Anyway, hope y'all get it figured out.

nissan lover
07-23-2006, 05:15 PM
they can test moduals just not mine. didn't have the right hook up or some other bullsh*t.