skipping problem

[carfrk666]

my Q has developed a pretty nasty skip, but it doesnt do it at a certian RPM range, it does it at a speed range, approximatly 45-65 mph, it used to be around 50-60 mph, but the range has opened, i would be cruzing along and it would start to skip, so i get into the throttle and it goes away, then the skip comes back, i shift into manual third, cruzing along and the skip comes back!!! WTF MATE? any ideas???

[maxnix]

And your car's maintenance history is?

Any doulble Dutch competitions nearby?

[qship96]

2000 miles after you rebuilt your motor? Hmmmm

[Q45tech]

First use BG44k to clean injectors and intake valves of deposits.Assumming you've changed the spark plugs recently, then you do a power balance to gleen info on which bank might be misfiring.Other info from observing the O2 sensor waveforms and examining the adaptive learn % deviation of each bank while the problems occurs.

Like a doctor you must do tests and more test before doing an operation.BG44k is a medication to see what happens.

When cars like people get old the usual proceedure is to visit your physican [expert technican on Q] every 6 months to get test and adjust your medication BEFORE serious organ transplants are done or just let you die.

Your doctor may send you to a series of expensive or otherwise [T3]specialists to wash his hands of you.

Careful with mixing medications or over medicating and especially overthecounters..............applies to chemical car additives also.

One of my medical mornings where I've spent all night studying dna and gene methylations and Histone Deacetylase Inhibitors so ignore any adverse medical conotations I have other hobbies besides Q.

[96Q45GAL]

Not sure if you have the same problem I have been going through? If I go on the highway...When I get to about 50-65 and let my foot off the gas...It starts skipping/bucking!??... I seem to have a MAF issue... So check into that if you havent already?

[96Q45GAL]

I keep seeing postings out this BG44K...What is this and where can I get it? I asked at a local parts store( autozone) and he said he didnt carry it and you normally have to get it from a AutoShop?? I am wondering if I should throw a bit in mine?

[Q45tech]

When you decelerate the IAC acts as a dash pot to incrementally reduce the air bypass around closed throttle plate. A dirty, sticky or misadjusted IAC will cause problems as you describe on decelration.

[96Qowner]

http://www.bgprod.com/home.html

Also can find it on ebay, and in certain repair shops locally.

And you should also change the oil soon afterwards and, if the fuel filter isn't relatively new, change that out afterwards, too.

[Q45tech]

If you use 4 bottles of Techron in a quarter - half a tank of premium gasoline that will come close to the effect of 1 - 11ounce can of BG44k in a full tank.

Useful when you cant find the more economical BG44k............volume and strengthwise.

The cleaning effect requires that at least 100 miles is driven before evaluating responses!

[laidbackblk45]

Also, you can find BG44k at your local stealership. I went by the nearby Nissan dealership yesterday and picked up a can from the parts counter. The parts tech had the stuff right by the counter. They must sell and use a lot of the stuff .

[carfrk666]

maintance history is good, im a mechanic and i love to take care of my vehicle, the car is up to 296,000 miles now, motor rebuild long time ago, i shall try BK44 and im not due for the plugs but im going to do them anyways, nope my car skipps at a steady throttle and if i let off it goes away, if i give it a little more gas it is still there and if i give it enough gas to downshift it goes away .. . .im gunna check out my MAF and my TPS. could it be a velocity sensor of some sort? either a wheel sensor or a RPM sensor in the transmission, because its not as if it does it at certian RPM but it does it at a certian speed? just a thought . .

[Q45tech]

Usually the speed and rpms are tied together, try only driving in town [below 55 mph] in 3rd gear position. That is a diagnostic test!

[ddrumman]

........................motor rebuild long time ago, .........................

I don't mean to be off point, but can you tell me how did you rebuild the Q's motor? According to everyone on this forum your average machine shop does NOT have the necessary/sophisticated enough machines/tools for that type of job.

[carfrk666]

I don't mean to be off point, but can you tell me how did you rebuild the Q's motor? According to everyone on this forum your average machine shop does NOT have the necessary/sophisticated enough machines/tools for that type of job.

well at the time i had worked in a machine shop, it is 100% possible to rebuild that engine, the harder part is finding parts for it and then putting it all back together, but i went and ground all my valves and cut all the seats for them, i only ball honed the cylinders however u can also use a hone machine and bore it if u can find the pistons and rings for that, the rods where reconditioned and the crank was ground down a bit, its not a bad project to do either, if u want more infoabout it then u can email me or something.

[carfrk666]

ok well i put the scan tool on my car the other day in skool and i have a knock sensor circuit bad and a bad left bank o2 sensor, and my transmission is complaining about the TPS sensor but the engine sees nothign is wrong with it, again i say WTF? its gunna be a merry x-mas to me buyin new parts for my baby, im goin to go out on a good limb and say that these are the cause of my skipping problem

[qship96]

TPS sensor is the main cause of your problem....knock sensor results in less overall power,but bad TPS will cause problems you are experiencing.

[Haitian_King]

Not sure if you have the same problem I have been going through? If I go on the highway...When I get to about 50-65 and let my foot off the gas...It starts skipping/bucking!??... I seem to have a MAF issue... So check into that if you havent already?

When I had that problem, it turned out to be an injector.

Exact same symptom. I don't have any MAF problems that I'm aware of. I even wiggled my connector today. No cahnge in idle.