Hello...I searched for something like this but didn't turn up anything...
car: 89 24sx coupe (KA24E)
I'm having a problem that is driving me nuts.
When I'm cruising along at speeds 70-100+KMPH the car jerks ever so slightly every few seconds...sort of has good days and bad days.
-I had 2 injectors replaced recently, and then other 2 seem fine-Could this be from an exhaust flow issue? It sounds like crap and I think it could possibly have a plugged cat that would cause this? -Could it be an O2 sensor?-could it just be crappy belts? They are in need of replacement, but would a slipping belt cause that?-ALso, It seems to be worse in over drive. If it really starts to bother me I usually take it out of OD and then I don't really notice it...-I had it checked out by a transmission pro. and he didn't think it was the transmission because it shifts fine, and the oil is good...
Sort of a 240 n00b...It just helps to narrow this down before I do something on it because I'm at university all week, and then work all weekend...ergo I have not much time to fiddle Any help or thoughts would be appreciated
Modified by CDE at 12:01 AM 3/23/2005
very slight jerkyness when driving...
Forgot one thing...
There also seems to be a loss of power...When I boot it to pass someone or to make a light, the engine works real hard but it doesn't seem to have the pull it should.
(it's an auto...sadly).
Another thing I just thought of...would a vacuum hose leak cause this discrepancy?
Modified by CDE at 12:12 AM 3/23/2005
There also seems to be a loss of power...When I boot it to pass someone or to make a light, the engine works real hard but it doesn't seem to have the pull it should.
(it's an auto...sadly).
Another thing I just thought of...would a vacuum hose leak cause this discrepancy?
Modified by CDE at 12:12 AM 3/23/2005
Re: (NISTECH)
I drive my car a lot and I need it to work properly. I also am at University and work a lot and it's hard to find daylight to work on my car - I just like narrowing it down as much as possible before I start taking stuff apart and buying uneccesary parts..."jerkyness" perhaps wasn't the best word...it's like a shudder...very slight when I'm cruising at almost any speed. It doesn't happen when I accelerate. Does that help a little more?NISTECH wrote:lol wow you went from trying to fix your car, to wanting to unload the problem before you even started working on it. I have a honda sabre if you wanna trade?? it needs work to though.
Its hard to say what is cuaseing your problem as I really dont quite understand what you mean by the car jerks.
And a honda sabre eh? I don't really want to unload this car because a few things are going wrong, It's just that I've wanted a bike for quite a few summers now and theswe problems...along with gas prices are giving me good excuses to buy one. I was looking for a Magna or sabre 750. It is a great handling bike - apprently. How did you like your sabre and what yr is it? What wrong with it?
Modified by CDE at 11:51 PM 3/25/2005
its an 84 and its more of a touring bike then a crouch rocket. It need a few parts to be road worthy, head light, speedo cable , battery and fluid exchanges. The tank also needs to be cleaned out as it has varnished remniants in it and it wont pass fuel through the pet c***.
On your car does it feel like transmisson or engine causeing it. If it feels more like a trans issue I would say check the tps adjustment it may be on and of the hard idle contacts if its adjusted to high.
On your car does it feel like transmisson or engine causeing it. If it feels more like a trans issue I would say check the tps adjustment it may be on and of the hard idle contacts if its adjusted to high.
Re: (NISTECH)
Yes...I do not want a crotch rocket right now. I was something cheap to buy and comfortable to ride and also something with some decent power. I'm looking at the Magna's because a friend of mine had one and he liked it. The sabre is just a little 'sportier' looking. You never said if you liked it or not...NISTECH wrote:its an 84 and its more of a touring bike then a crouch rocket. It need a few parts to be road worthy, head light, speedo cable , battery and fluid exchanges. The tank also needs to be cleaned out as it has varnished remniants in it and it wont pass fuel through the pet c***.
On your car does it feel like transmisson or engine causeing it. If it feels more like a trans issue I would say check the tps adjustment it may be on and of the hard idle contacts if its adjusted to high.
tps = throttle position sensor?My initial thoughts were that it was the trans. The top 2 gears seem to fight for position thus causing the shudder - at least that what it feels like. how would I adjust the TPS down if it is too high?
the correct way to do it is to use a feeler gauge and hook up to the switch, at about .012 in it should be off [open circuit] at about .008 inches it should be on. if it is still on at .012 it could be causeing problems with the shift points in the trans. put the feeler gauge between the throttle stop and the throttle cam the cables are hooked to and the car must have been previously warmed up.
Now the way most people do it is to back probe the TPS center wire and measure the voltage at idle and set it between .3 and .5 volts.
Now the way most people do it is to back probe the TPS center wire and measure the voltage at idle and set it between .3 and .5 volts.
Re: (NISTECH)
I found a cracked hose upon an inspection tonight. It is the hose that goes to the top of the valve cover on the side opposite to the oil cap. I will be replacing this after the holiday once stores are open again...perhaps for some kind of temporary duct-tape fix...heh.
Could this cause these symptoms? I'm also going to check all the other hoses the best I can later tomorrow. do I just spray carb cleaner on the hoses and look for bubbles for cracks?
I will also see if I can check the TPS tomorrow depending if I can find a feeler gauge or a multi-meter somewhere...
Thanks for the tips
Could this cause these symptoms? I'm also going to check all the other hoses the best I can later tomorrow. do I just spray carb cleaner on the hoses and look for bubbles for cracks?
I will also see if I can check the TPS tomorrow depending if I can find a feeler gauge or a multi-meter somewhere...
Thanks for the tips
ok, today the car was doing it way worse. The RPM's were actually going down 200-400 ... I'm getting pretty worried and I don't really want to drive it as I'm mostly driving on a big highway to and from university. It happened more noticeably when I was going downhill (VERY slight downhill) and it still seems to go away when I accelerate. Only seems to happen in OD.
Would a pooched TPS still cause this? or is it sounding more like a transmission slip?...because that's what it kinda felt like (but I'm no expert).
And my 'broken' speedo (electronic with HUD) sort of comes to life...a few bars on the speedo light up but nothing that makes any sense is displayed then it blinks off again after a while...
Would a pooched TPS still cause this? or is it sounding more like a transmission slip?...because that's what it kinda felt like (but I'm no expert).
And my 'broken' speedo (electronic with HUD) sort of comes to life...a few bars on the speedo light up but nothing that makes any sense is displayed then it blinks off again after a while...
Re: (NISTECH)
I wanted to replace the speedo head for a few months now but haven't had a chance to go to a junk yard. I'll get right on it asap...NISTECH wrote:your speedo is your speed sensor for the engine and trans control !
lol
but would it cause that big of a drop in RPM? Today was the first time it did that big of a drop.
and a new unit is 300 bux...I'm praying a junk yard has one.
Also, could the busted head unit explain why the cruise control is not working?
I'm hoping this one part fixes all my problems.
Modified by CDE at 12:10 AM 3/29/2005
The speedo is the input sensor for all speed related functions of your car, i.e. trans govenor,cruise control. So I would have to say yes to your cruise problem. That little bit of info would have helped early on in the thread about the speedo not working. Since you gave a speed range when the problem occured I assumed you had a working speedometer.
Re: (NISTECH)
Yes, I feel like a moron. I thought I had mentioned it, but that was in a different thread. Sorry for the troubles...I'm learning new things every day
Thank you for the quick resonses though.
Thank you for the quick resonses though.
Re: very slight jerkyness when driving... (CDE)
Well....I have some great news, and some shanty news.
I picked up my new speedo today....319bux canadian after taxes, and it works wonderfully. Cruise control also works as well as the odo - which was expected. However my "jerkyness" problem is still worsening.
Tonight I had it in cruise going 80kph, and it was OK for about 3 minutes until it started to studder and even downshifted abruptly a few times for no reason.
Is this making more sense? Any info greatly appreciated.
I picked up my new speedo today....319bux canadian after taxes, and it works wonderfully. Cruise control also works as well as the odo - which was expected. However my "jerkyness" problem is still worsening.
Tonight I had it in cruise going 80kph, and it was OK for about 3 minutes until it started to studder and even downshifted abruptly a few times for no reason.
Is this making more sense? Any info greatly appreciated.
do the Tps check I metioned earlier. You need to find out if it is going on and off hard idle contacts.
BTW I need to make a correction regarding something I said earlier in the thread about the speedo. Due to recent research on another thread I was working on I have found the speedometer is an input to the trans for speed related issues but it is not the governor. The revolution sensor is, but as far as your problem goes it is not whats causeing it. When that sensor goes it shows it self off the line as it wont allow the car to shift out of first.
BTW I need to make a correction regarding something I said earlier in the thread about the speedo. Due to recent research on another thread I was working on I have found the speedometer is an input to the trans for speed related issues but it is not the governor. The revolution sensor is, but as far as your problem goes it is not whats causeing it. When that sensor goes it shows it self off the line as it wont allow the car to shift out of first.