| ~30oZ~ |
sometimes when i start the car and drive away the car vibrates...SHAKES alot and the car feels it has lost a lot of power....any idea how to fix the problem and what's causing it?
thanks for the help,
Edwin S |
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| HeavyEarly87T |
Does the check engine light come on?
Do you know how to get any engine codes?
Is it a engine thing really or does it feel more like clutch issues?
Does this only happen when cold?
Those questions will help you & us solve this problem.
This car was imported recently, yes?
Sounds like it is misfiring to me. My guess would be cold start is not working. but that is just a guess.
Url. |
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| MixManMash |
| Does it happen when you are continuosly driving? under hard acceleration? moderate acceleration? |
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| vorpalz |
Is the car throwing any codes? PTU? (code 21) CAS? (code 11). Either of which will cause shaking (mis-firing) and poor performance.
I experienced both, which I fixed by connector cleaning (using small files and spray contact cleaner) and unfortunately, replacing my CAS ($$$ from Nissan)
Hope the first option fixes your problem.
Regards, |
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| ~30oZ~ |
| No check engine light came on what so ever, and on the way back from work the car was running strong and normal like it always does most of the time:dunno: the shaking only occurs once in a while but goes away when it wants too. It did this on hot and cold days before. doesn't feel like clutch at all (clutch was replaced already), The car was imported from Vancouver, it's not JDM it's CaDM...like i said it went away after work and drove like new...it's a freak thing but i still want to fix what ever it maybe. |
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| Inzane |
I'm going to guess its a harness connector issue too.
But the problem with these random intermittent quirks is they won't always throw a code. (so checking the ecu codes is not a 100% reliable method)
I'd suggest checking and cleaning as many of the major connectors as you can: CAS, PTU, MAF, TPS, Coolant Temp, Coil Packs, etc. |
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| ~30oZ~ |
quote:
Originally posted by Inzane
I'm going to guess its a harness connector issue too.
But the problem with these random intermittent quirks is they won't always throw a code. (so checking the ecu codes is not a 100% reliable method)
I'd suggest checking and cleaning as many of the major connectors as you can: CAS, PTU, MAF, TPS, Coolant Temp, Coil Packs, etc.
Ron did say i'll be needing a new wiring harness come spring...could that be it Jason? how can i find where all the connectors are? does twinturbo.net have a walk through? |
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| Inzane |
quote:
Originally posted by ~30oZ~
Ron did say i'll be needing a new wiring harness come spring...could that be it Jason? how can i find where all the connectors are? does twinturbo.net have a walk through?
Yeah if your overall harness condition is bad, that could definitely be a contributor to the problem.
One of the first things you should do is definately buy a Factory Service Manual. You are lucky you have a 93 (the 1990 manuals are discontinued and hard to get). Last time I bought a '93 FSM it only cost ~ $40 give or take a bit, and I ordered it through Ericksen. That was only a year or two ago (when I bought my second copy). |
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| Inzane |
quote:
Originally posted by vorpalz
True, but it's a good place to start.
I wasn't suggesting not to check the codes. Its an obvious first place to start, and easy to do. Just that it often won't end there.
I won't be surprised if Edwin doesn't find any abnormal codes this first time. But I guess we'll see...
BTW Rob, nice pics! :thumbup: |
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| vorpalz |
I rigged up my in-car switch for immediate code checking (wired a momentary switch into pins 8 & 9 on the consult port) because I was having intermittent running issues much like ~30oZ~ is having. When the car ran like sh!t, I would pull over and immediately check codes. It didn't always generate a code, but many times did, mostly code 21's and 11's. I would be in safety boost with no codes generated as well, a det. sensor problem that eventually generated a code 34. I eventually moved the PTU because of these issues, and no problem since. Had to replace the CAS tho.
Regards, |
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| Inzane |
quote:
Originally posted by vorpalz
When the car ran like sh!t, I would pull over and immediately check codes. It didn't always generate a code, but many times did, mostly code 21's and 11's. I would be in safety boost with no codes generated as well, a det. sensor problem that eventually generated a code 34. I eventually moved the PTU because of these issues, and no problem since. Had to replace the CAS tho.
Wow... all that would've driven me absolutely crazy!
I just installed a *new* PTU this summer because my old original one finally died (and left me stranded), but I haven't "relocated" it yet. |
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| MixManMash |
Did you replace your PTU with the same series (1993 and older) or with the newer one (1994+)?
The 1994+ PTU's don't give out like the 1993's do from what I have read.
I am just waiting for mine to fail and then I'll replace it with this http://www.courtesyparts.com/Mercha...ode=22020-00Z32
(complete kit for changing your 1993 and older car to use the new PTU) |
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| Inzane |
quote:
Originally posted by MixManMash
Did you replace your PTU with the same series (1993 and older) or with the newer one (1994+)?
Haha... I hope you're kidding. I don't think you can even buy the old-style (90-93) PTU anymore, but even if you could it'd be stupid to do so.
quote:
The 1994+ PTU's don't give out like the 1993's do from what I have read.
That's correct.
quote:
I am just waiting for mine to fail and then I'll replace it with this
Take my advice and DON'T.... wait that is. Don't wait! I pushed my luck for years and years and when mine finally died it was just by sheer luck that I was only a block away from a tire shop that had just done my alignment. I was able to leave the car there overnight so I could return the next morning with a new PTU that I fortunately was able to buy off a fellow clubmember (some of the dealerships don't even STOCK them regularly!!).
Take my advice and at least BUY the new PTU now and put it in your glovebox (if you're too lazy to install it now). You'll thank me. |
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| MixManMash |
| I think I might do that. I'd hate not to be able to drive the car while I am waiting for a part. |
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| Inzane |
quote:
Originally posted by MixManMash
I think I might do that. I'd hate not to be able to drive the car while I am waiting for a part.
LOL
I don't think you fully understand the consequences of a spontaneous PTU failure. You make it sound like your car is sitting at home safe and sound in your garage and just not able to start one day, and therefore you're not able to take it out and use it until you get a replacement. La Dee Da.... LOL :D
Forget about just not being able to drive the car while you wait for a part. Think about being stranded with the possibility of having to LEAVE your vehicle somewhere!! - cause your stuck in rush hour traffic in some far corner of the city and can't get a flatbed for over an hour, or you're out on the highway in the middle of nowhere, etc.
The PTU is not going to choose a time to fail when its most convenient for you. And you can't expect to be able to just re-start the car and drive home. (although Gord had somehow managed that on one of his Z32s apparently, by leap-frogging home with cycles of cooling the car down and restarting after periods of 20-30 minutes at a time with the car dying repeatedly). I got my car re-started about 3 times and then after that it was dead as dead. And there was no way I was going to get from one end of the city to the other in rush hour traffic by continually stalling (and going through the process of trying to get started again) all the way. |
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| MixManMash |
ok. gotchya. first thing to do next year. car is unfortunately about to be parked for the winter :(.
BTW, anybody know how the IGN and CHK from the Diagnostic (Consult) Port is connected to the ECU? I need to check the wiring because I cannot simply short the IGN and CHK to get the trouble codes from my ECU. I am guessing there is something wrong with the wiring. |
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| Inzane |
quote:
Originally posted by MixManMash
car is unfortunately about to be parked for the winter :(.
Why? We've probably got another 4-6 weeks of the driving season left. My rule of thumb has typically been target for Nov. 1st plus or minus two weeks. I used to live up in Fort McMurray, and I've owned my Z since '98. The earliest I can recall ever having to put the car to bed for the winter was Oct. 15th. The average seemed to be about Nov. 1st, and in recent years living in Edmonton mid-November was not unrealistic. Heck last year I stored the car officially on the night of Dec 3rd, right before an overnight dump of snow.
On the one hand its nice to be safe than sorry and not stuck with your pants down with a dirty car & an empty gas tank, etc. and not able to store a CLEAN car with a car cover and a full gas tank, yadda yadda yadda.
But on the other hand, it sucks to be so diligent that you are ready for winter so far in advance that you watch weeks go by where you still could've been enjoying your car but you can't because you've decommissioned it, pulled the insurance, etc. D'OH!!!!
quote:
BTW, anybody know how the IGN and CHK from the Diagnostic (Consult) Port is connected to the ECU? I need to check the wiring because I cannot simply short the IGN and CHK to get the trouble codes from my ECU. I am guessing there is something wrong with the wiring.
Not sure on the specifics there. You might want to check with Rob on that. He has a '90TT so your wiring should be identical, and he's used that shortcut method a lot. All I know is the wires in question run from the driver side behind the dash (by the consult port) to the passenger side behind the floorboard (by the ecu). What a big help I am, eh? LOL |
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| MixManMash |
quote:
What a big help I am, eh? LOL
No worries. Not overly concerned but it sure would be nice to have it actually work so I don't have to pull the floorboard every damn time.
quote:
We've probably got another 4-6 weeks of the driving season left.
I guess, I will wait and see what the weather does before parking the car. And if it snows, I still have my other car insured anyways. Heck, I am so anal about keeping my Z clean that I don't even like driving it if it's going to rain. |
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| ~30oZ~ |
thanks for all the help guys! i'll update as soon as i solve the problem.:thumbup:
happy boosting!:D |
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| Inzane |
quote:
Originally posted by ~30oZ~
thanks for all the help guys! i'll update as soon as i solve the problem.:thumbup:
happy boosting!:D
Hey Edwin, sorry we kinda hijacked your thread here.. ;) |
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| ~30oZ~ |
quote:
Originally posted by Inzane
Hey Edwin, sorry we kinda hijacked your thread here.. ;)
I don't mind at all!:thumbup: post away guys:)
:beer: |
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| MixManMash |
quote:
Hey Edwin, sorry we kinda hijacked your thread here..
Yeah, same here. We got off topic. |
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| ~30oZ~ |
| Ok well, I found out today it's because my O2 sensor is on it's way out in the near future so it wasn't reading right but I'm going to leave that till spring, But I did ended up replacing my Master Brake Cylinder today .:( oh well... at least my car is a little happier now.:) |
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| superspeed |
| wow lots of stuff already being replaced for u ~300zx~ hmm since winter is coming soon =*( is there any last meetings? i was gonan go to the one on oct1st but seems far =\ hopeing if u guys have a meet have it like at northgate or even united cycle would be nice =) |
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| Inzane |
The Edmonton Z Car Club monthly meeting is tonight.
7:30 pm
German Cultural Canadian Club
8310 Roper Rd.
We meet in the back of the restaurant, then spill out into the parking lot after. (we usually park on the north side of the building)
Don't be shy.
Jason
VP - EZCC |
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