boostedZ Posted May 6, 2009 Share Posted May 6, 2009 So i think i found my problem on my 1983 280zx turbo. I've gotten multiple people telling me its the TPS and im starting to think it is also. My question is how do i adjust it? the online book says to take off the black cover and check to make sure left and right metal is touching the center at the right time, but it seems like the black cover can't be taken off or can it? also, do i have to take it off or is there a way to adjust it by hand? Quote Link to comment Share on other sites More sharing options...
Ferrariferg Posted May 6, 2009 Share Posted May 6, 2009 Just replace it. They are fairly inexpensive. If you really want to open it then you need to drill out the 2 rivets that hold it shut. There really isn't any adjusting you can do other than to bend the arms inside to make sure they are making contact. Quote Link to comment Share on other sites More sharing options...
woldson Posted May 6, 2009 Share Posted May 6, 2009 If your going to buy a new one, just pry the cover off and screw around with it. It is very simple device, you really not going to hurt anything. Quote Link to comment Share on other sites More sharing options...
boostedZ Posted May 6, 2009 Author Share Posted May 6, 2009 Oh okay, thanks guys I'll just go order a new one and play with that old one. Quote Link to comment Share on other sites More sharing options...
RUZN Posted May 8, 2009 Share Posted May 8, 2009 Yeah its a mini potentiometer (rheostat) type deal just a bunch or contacts that the sliders cruises across and gives a resistance reading... My question: I have been off and on running super rich then not mostly from stoplight to getting going.. is this a TPS deadspot? or should I look at my MAF? I did the 300zxt ECU swap so I have MAF now but its so weird. Started happening couple days back made all sorts of adjustements to try and compensate.. seems liek sometimes its there sometimes its not.. but when it is I can ust go through gas liek no tomorrow and blow some good mini clouds of black smoke. Ive tried testing everything soooooooo anyone else have this problem... might just do a Wrecker run find another MAF and tps see it it clears the condition. Quote Link to comment Share on other sites More sharing options...
Ferrariferg Posted May 8, 2009 Share Posted May 8, 2009 The TPS on a 280ZX isn't a potentiometer type. Its just a simple switch type. It only measures closed throttle and WOT. Quote Link to comment Share on other sites More sharing options...
zxtman Posted May 8, 2009 Share Posted May 8, 2009 There really isn't any adjusting you can do other than to bend the arms inside to make sure they are making contact. I don't agree with that statement. There are 2 fasteners that attach the TPS to the throttle body and the TPS can be rotated for adjustment. Quote Link to comment Share on other sites More sharing options...
Ferrariferg Posted May 8, 2009 Share Posted May 8, 2009 Your right. But it doesn't really do much. At least not in my experience. I've played with the adjustment on 4 different TPS, 2 on an NA and 2 on a Turbo, and I never noticed any difference in either idle or WOT. Maybe It was just me. I don't know. It made a noticeable difference in my friends 240sx, so maybe its just the type of TPS. I'm definitely no expert. lol. Quote Link to comment Share on other sites More sharing options...
skib Posted May 8, 2009 Share Posted May 8, 2009 Your right. But it doesn't really do much. At least not in my experience. I've played with the adjustment on 4 different TPS, 2 on an NA and 2 on a Turbo, and I never noticed any difference in either idle or WOT. Maybe It was just me. I don't know. It made a noticeable difference in my friends 240sx, so maybe its just the type of TPS. I'm definitely no expert. lol. as I understand it the ZX TPS is (basically) an on/off switch, were as the SX TPS can do the on/off function but also provides information inbetween "on" and "off". so the SX TPS on my ZXt reads only on/off because thats all the ECU knows to read, but will read more on an SX ECU Quote Link to comment Share on other sites More sharing options...
Ferrariferg Posted May 9, 2009 Share Posted May 9, 2009 I didn't know a TPS from a 240sx would work with the stock ecu. I got one from a friend and modified it to work with the stock harness for my megasquirt that I'm working on but I didn't use it because I didn't want to fry anything. Quote Link to comment Share on other sites More sharing options...
skib Posted May 9, 2009 Share Posted May 9, 2009 Im using the 240sx TPS with my 81 harness and ECU and the 240SX 60mm TB with no issues. Quote Link to comment Share on other sites More sharing options...
Ferrariferg Posted May 9, 2009 Share Posted May 9, 2009 Which 240sx does the 60mm throttle body come off of? (S13 with single cam or dual cam or S14) And does it just bolt on or do I need an adapter? Does it work with the throttle linkage or do I need to use a cable? Sorry for all the questions, but I've been trying to find someone with the 240 TB setup. Quote Link to comment Share on other sites More sharing options...
skib Posted May 9, 2009 Share Posted May 9, 2009 Which 240sx does the 60mm throttle body come off of? (S13 with single cam or dual cam or S14) And does it just bolt on or do I need an adapter? Does it work with the throttle linkage or do I need to use a cable? Sorry for all the questions, but I've been trying to find someone with the 240 TB setup. Its been pretty well covered in archives. It will bolt right up but if you want to retain the stock throttle linkage youll need to mod the linkage on the TB and use a 1in spacer. Idk about the s14 but I know the s13 single cam KA has it. other than that just port your intake mani out to 60mm. Quote Link to comment Share on other sites More sharing options...
RUZN Posted May 10, 2009 Share Posted May 10, 2009 Yeah see Im using a VG30 TPS with a Stanza 60MM TB but I flipping mine upsidedown so the linkage is on the drivers side and the TPS is facing the Pass Side of the TB. This way I did not need a Spacer, But I also used the Stock Linkage from the firewall and just looped a Cable around it and used Cable ties to secure the Loop then ran just enough length to the TB to which I took the VG30 Cable (grabber thingy umm the thing the cable loops around) and mounted it as normal.. SO I have about a 2.5' cable straight from firewall stock linkage to TB and Added an Extra Spring so it returns immidiately.. hehe... Only issue I have now is suddenly I developed a Rich burning deal... Was perfect for weeks so I suspect.. a Temp Sensor.. Old stock injectors or something wacky going on Quote Link to comment Share on other sites More sharing options...
RUZN Posted May 10, 2009 Share Posted May 10, 2009 Oh also if you Test the TPS with a Ohm meter you can see it reads more and more resistance up to about 30% throttle then it hits WOT (switch closed) and if you rock it back and forth to change the first stage resistance you do get a different Throttle Responce....... just so you know......... Quote Link to comment Share on other sites More sharing options...
hchase17 Posted May 10, 2009 Share Posted May 10, 2009 it adjusts in a similar way as the distributor when you adjust the ignition timing...u can loosen the two screws and turn it left or right and believe me it does make a difference Quote Link to comment Share on other sites More sharing options...
blu240z Posted October 4, 2009 Share Posted October 4, 2009 Anyone know adj procedures Quote Link to comment Share on other sites More sharing options...
borini63 Posted October 5, 2009 Share Posted October 5, 2009 It's in the FSM. Quote Link to comment Share on other sites More sharing options...
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