Someone please help
Guest
Posts: n/a
Someone please help
Im having a problem with my 1983 280zx. It starts fine, but when you get into the 3-4 (and sometimes lower) rpm's the car seems to die out. This doesnt happen until around the 5000s if you are giving it gas slowly but if you punch it, the car seems to do it alot quicker. What happens is the car will stop rasing rpms and sometimes go down no matter how much gas you apply until you get off the throttle. I thought it might be something to do with the turbo, but when I took it down to the local shop they kept it for 3 months and gave it back, just as stumped as I was.
Any help would be great, thanks.
Any help would be great, thanks.
Guest
Posts: n/a
Most likely it's not the O2 sensor; It shuts off during WOT.. Have you checked the fuel pressure yet? Autozone now sells an EFI fuel pressure tester for around $40. The problem might be from a worn out fuel pressure regulator. Also, have you tested out the cyllinder head temp sensor? it's on the back of the head above the oil filter. Usually the sensor is not bad, but the wiring harness going to it might be shot. make sure that all of the connections are clean and that the wires have continuity.
Registered User
Joined: Jul 2003
Posts: 131
From: Southside of Atlanta Georgia
tps
need to check the throttle position switch with an ohm meter and check its function. Be sure air cleaner is clean and you might want to check exhaust system if its old. Catalic converters have been known to come apart and plug up or restrict exhaust..........One other thing i thought of, whats the boost gauge doing when it starts bogging down. Watch it and see if boost starts to go up or if just loose all vaccum and no boost at all. Need to take of heat shield and watch the by-pass controller move at the turbo. You will see it, its round and has a rod coming out of center, make sure it is working and hose going to it is not split or off
Last edited by Jimmys83Z; Sep 29, 2003 at 09:47 AM.
Guest
Posts: n/a
I am having the same problem
Accept mine is worse. Every now and again the engine will run well at idle, but the second you touch the gas the dang thing starts to cut out. I am guessing it is the TPS. I have a new one but need to get the car back from the body shop to install it. I will let you know how I make out.
One question I do have is how do you adjust the TPS. The shop manual confuses me a bit on. Can someone help explain it with a bit more detail?
thanks
One question I do have is how do you adjust the TPS. The shop manual confuses me a bit on. Can someone help explain it with a bit more detail?
thanks
Registered User
Joined: Jul 2003
Posts: 131
From: Southside of Atlanta Georgia
directions
just follow step by step what book says and you should be okay. You can test it on the car which you should do so you will know if that is the problem or not. If you cant figure it out let us know and will try to put it i plainer english. It sounds complex but it is easy to if you know how to use an ohm meter. Which is what you need to set it correctly...
Registered User
Joined: Jul 2003
Posts: 131
From: Southside of Atlanta Georgia
tps
1 diconnect tps and look on plug and tps for the #'s 29 &30
2 test meter by touching red and black probes, needle should go to 0 and may beep, if yours does this,mine does.
3 you will need help
4 red probe to either 29 0r 30 on tps and black to other
5 you will need tach to work
6 have someone start car while you watch meter. When you touch probes to tps slots meter will move. Check your idle speed, then rev engine to 900 slowy while watching meter. As engine hits 900 rpm's tps should cut off and needle will go back down like your not touching anything with probes. You may have to adjust it one way or other to achieve this. If you have no conntinuity in any position replace it.........
2 test meter by touching red and black probes, needle should go to 0 and may beep, if yours does this,mine does.
3 you will need help
4 red probe to either 29 0r 30 on tps and black to other
5 you will need tach to work
6 have someone start car while you watch meter. When you touch probes to tps slots meter will move. Check your idle speed, then rev engine to 900 slowy while watching meter. As engine hits 900 rpm's tps should cut off and needle will go back down like your not touching anything with probes. You may have to adjust it one way or other to achieve this. If you have no conntinuity in any position replace it.........
