This my first post here, so Hello. I have posted this question on a couple different forums and asked several people I know as well as just general research and haven't been able to get more than a best guestamite from anyone.
Here is my problem.
I have a 92 s13 hatchback 5spd with about 120,xxx miles on it (i am the second owner). When you get above 4 grand the acceleration drops off noticeable. It occurs in every gear (i haven't really tested 5th). If you are going up hill it wont hardly pull at all. All it really does is make a hell of a lot of noise and sometimes at 5.5K you can feel the power drop significantly. and I can't get to red-line at all. Generally it lacks any top end power. Also the speedo will go from showing my speed, to about 20MPH fast, back down again back, up and what ever it feels like doing, I have noticed the temp gage do the same thing only not nearly as often, I am wondering if the tach is off as well.
The car overheated before I bought it, and dumped coolant into the motor. The head was re-planed and everything was supposedly fixed correctly. I bought the car a short time later. My mechanic said the performance problem was probably a bad o2 sensor or fouled plugs or something contaminated from the coolant.
I have: Set timing (about 19 BTDC)(it was retarded so far you couldn't tell where it was on the indicator) changed plugs (NGK Iridium .44gap) replaced Wires, cap and rotor, all Borge Warner Replaced the o2 sensor, Bosch Replaced fuel filter, WIX Changed oil, Mobile 1 Air filter is clean cleaned MAF with electrical cleaner check fuel pressure (40 PSI at idle, 35 PSI cruising w throttle closed, 45 WOT) replaced a cracked vacuum line removed AIV Removed intake resonator* I also cleaned AIC, now I have a vacuum leak due to (me) sucking with RVT, I am waiting on the gasket from Nissan( now my car idles good, Thanks NICO FAQ)* cleaned the throttle body listened to the injectors, they all fire and wiggle tested good. Ran Lucas fuel system treatment through it* Removed the cat to check for clogs, no clogs, replaced cat.
*=marginal improvement in performance
Motor mounts need to be replaced
I think that is it.
This is supposed to be my auto cross car and I can't get enough power out of the top end, where I need it When I ran my V I was mostly above 4K (it seamed anyways). This is irritating the crap out of me, and I just want to get it fixed so the stupid thing will run right. any help would be greatly appreciated. thanks
Don
poor acceleration ??? HELP PLEASE!
It also does this under a no load condition. you can rev the motor, but once you hit about 6K to 6.5K it won't rev any higher and it sounds like its about ready to come apart. some times it will hit 5.5k to 6.2k then, it almost seems like it hits a fuel cut off or something. the rpm's drop way down (around high 4's to low 5's), and then come back up again. I don't know if any of this is relevatnt or not, bit I thought I would through it out there.
Modified by cracker at 8:33 AM 3/5/2005
Modified by cracker at 8:33 AM 3/5/2005
Have you checked out if your knock sensor's going screwy? It can retard the timing if that's getting triggered.
Another question, when you say it's not really accelerating past 4k, do you mean it's not pulling as much as it was at oh lets say round 1200rpm or it just doesn't accelerate anymore until you switch to a higher gear?
Another question, when you say it's not really accelerating past 4k, do you mean it's not pulling as much as it was at oh lets say round 1200rpm or it just doesn't accelerate anymore until you switch to a higher gear?
I am not for sure how to check it.
That is one reason why I am replacing the motor mounts in it this week. I just ordered my nismo MM's (YEAH, Parts!).
If some one ould tell me how to check the knock senson I will check it. I am not for sure where it even is
Also it does this under no load conditions. And tonight I was going up a hill in second and tried to see how far it would rev, it only went up to about 5.5K
Edit:
When it gets to about 4k iit starts to loose power, like the it doesn't rev as fast as it does at 3K, the higher you get the slower it revs until you get anywhere 5.5K to 6.5K(depending on if your going on a flat road or up a hill) then you could weld the peddle to the floor and it wont go any higher until you upsift. It sounds like it is ready to come apart in the higher rpms.
My specV pulls hard all the way to redline and doesn't vibrate nearly as bad, but Im sure the motor mounts have a lot to do with it.
I don't know what the rev limiter feels like in the 240 but I don't think I have ever hit it. When I have hit it in my V I know it, it is a very hard cut in power. But I don't know if they use the same kind of cutt-off
Modified by cracker at 8:34 PM 3/6/2005
That is one reason why I am replacing the motor mounts in it this week. I just ordered my nismo MM's (YEAH, Parts!).
If some one ould tell me how to check the knock senson I will check it. I am not for sure where it even is
Also it does this under no load conditions. And tonight I was going up a hill in second and tried to see how far it would rev, it only went up to about 5.5K
Edit:
When it gets to about 4k iit starts to loose power, like the it doesn't rev as fast as it does at 3K, the higher you get the slower it revs until you get anywhere 5.5K to 6.5K(depending on if your going on a flat road or up a hill) then you could weld the peddle to the floor and it wont go any higher until you upsift. It sounds like it is ready to come apart in the higher rpms.
My specV pulls hard all the way to redline and doesn't vibrate nearly as bad, but Im sure the motor mounts have a lot to do with it.
I don't know what the rev limiter feels like in the 240 but I don't think I have ever hit it. When I have hit it in my V I know it, it is a very hard cut in power. But I don't know if they use the same kind of cutt-off
Modified by cracker at 8:34 PM 3/6/2005
One ore thing. if I unhook the o2 sensor it doens't really change anything performance wise.
I talked to my brother who is better with motors than I am, ford ones anyway. He said on the mustangs it is just used to help at ideal, and that alot of people with long/high duration cams will unhook them to help smooth out the ideal. Is this true for the KADE? or is the new o2 sensor I bought screwed?
I talked to my brother who is better with motors than I am, ford ones anyway. He said on the mustangs it is just used to help at ideal, and that alot of people with long/high duration cams will unhook them to help smooth out the ideal. Is this true for the KADE? or is the new o2 sensor I bought screwed?
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s13sr20chris
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Re: (cracker)
did you have to turn the dist way off to the side to get the timing right? this kinda sounds like poor valve timing. also, check that the swirl control valve is opening up when the engine revs. i have seen them cause a soft rev limiter type of effect before.
I had to turn the dist all the way to the right. We, my technicitian friend and I, were tring to set it @ 15 deg (is this too mutch advance?) and we never could get it. we tried moving the teeth on the distributor and we could only get 20 deg @ full lock one way or 10 deg @ full lock the other way. we never could get at 15.
How do I check the swirl valve? And how do I check the valve timing or should I have my friend do it. He is a tech for one of the saturn dealers here in town. I would like to learn how to do it myself, but I don't want to gernade my motor either.
I have a chiltons, I need to check it, to see if it has the info on how to do this. It sucks when it comes to getting info on the 240
Any help or a point in the right direction would be appreciated.
How do I check the swirl valve? And how do I check the valve timing or should I have my friend do it. He is a tech for one of the saturn dealers here in town. I would like to learn how to do it myself, but I don't want to gernade my motor either.
I have a chiltons, I need to check it, to see if it has the info on how to do this. It sucks when it comes to getting info on the 240
Any help or a point in the right direction would be appreciated.
i fixed the vacume leak, she ideals rock solid. Now all I have to do is figue this other problem out. I am going to try and test the swirl valve, and the knock sensor on thursday. Hopefully I will have my new motor mounts by then. I am still trying to figoure out how to test both of those things.
I still am not sure what exactly needs to be done to check the valve timing? If some one could tell what this entells it would help me out alot. I have found info on valve lash, cam run-out and other things related to that but not valve timing. Do I need to check to see if the chain is lined up on the sprokets correctly or if the cams are alighned right or what???
I still am not sure what exactly needs to be done to check the valve timing? If some one could tell what this entells it would help me out alot. I have found info on valve lash, cam run-out and other things related to that but not valve timing. Do I need to check to see if the chain is lined up on the sprokets correctly or if the cams are alighned right or what???
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s13sr20chris
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Re: (cracker)
yupcracker wrote: Do I need to check to see if the chain is lined up on the sprokets correctly or if the cams are alighned right or what???
should look like that.
Re: (s13sr20chris)
Thank you, the pick helps out alot. I will order the new gasket tommorow. I have needed to check the chain guide and tensioners anyways.
I went to check the cam alignment today, I think they arn't alighned correctly. But I am not sure. I am going to have a freind of mine help me check it in the next couple of days. I know when I am in over my head. I really don't feal like gernading my valvetrain or worse.
I did however get my nismo moutor mounts installed. one of the old mounts was ripped into two seperate pieces (top & bottom). I put the new mounts in and had to adjust the clutch linkage. I can't belive how smooth the motor feels with new mounts. Now all I have to do is get the alignment checked on the valves, and hopefully I will be done with the "have to fix " stuff. And I can get to the "want to fix" stuff.
I will update later on if this fixes the problem or not. I appreciate the help every one has provided thus far.
Wish me luck!
I did however get my nismo moutor mounts installed. one of the old mounts was ripped into two seperate pieces (top & bottom). I put the new mounts in and had to adjust the clutch linkage. I can't belive how smooth the motor feels with new mounts. Now all I have to do is get the alignment checked on the valves, and hopefully I will be done with the "have to fix " stuff. And I can get to the "want to fix" stuff.
I will update later on if this fixes the problem or not. I appreciate the help every one has provided thus far.
Wish me luck!
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audtatious
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Re: (cracker)
If you have questions about the timing marks, take pictures and post them. If the marks don't show in the picture, highlight the marks for the photo. That will be the easiest way for someone to validate it for you.
I think my cams are out of time. I will post a pic as soon as I get my acount setup on the photohost site. The intake cam indicator is almost at 12 o'clock and the exsaust indicator is at about three o'clock. And I am about 90% sure I am on the compression stroke of #1 cylnder. I put my hand over the sparkplug hole and felt + pressure, and the timing indicator is sitting on the second from the furthest left mark on the crank pully. Wich I belive is ATDC.
Edit: Sorry for the long delay I have been busy lately and haven't had time to dig into the problem.
Edit: Sorry for the long delay I have been busy lately and haven't had time to dig into the problem.
I think my cams are out of time. I will post a pic as soon as I get my acount setup on the photohost site. The intake cam indicator is almost at 12 o'clock and the exsaust indicator is at about three o'clock. And I am about 90% sure I am on the compression stroke of #1 cylnder. I put my hand over the sparkplug hole and felt + pressure, and the timing indicator is sitting on the second from the furthest left mark on the crank pully. Wich I belive is ATDC.
Re: (cracker)
Sorry for the size. I don't know how to scale it down