My 1982 280zx non turbo keeps on sputtering. When i first turn on the car it idles fine,starts up perfect and i can rev the enigine and everything looks and sounds good. as soon as the car warms up for around ten minutes is when the rpm's wont go higher than 2000. all the valves look good ive replaced the following parts
-Throttle position sensor
-ignition pickup coil
-ignition module
-mass air flow sensor
-fuel pump
-electronic ignition coil
-oxygen sensor
-CAT

any help???

 

I think this is the first major issue of all new zdriver members. You're more that likely about to hear "check your CHTS", as I don't see that on your list of checked parts. It is on the passenger side of the head, and it has a little connector that looks like an injector plug, check the connections, make sure they aren't corroded, mine were >.<

I think 3/4 of the people on this site have had the same issue.

 

do you think it would have anything to do with the ECU. ??

 

also replaced the thermo time switch

 

Not unless it were overloaded, in which you would be having a lot more problems that the current issue =P

Between Cylinders 5 and 6, check that, unplug the connector and check the leads. (Sorry for quality)
This is a very common culprit for the issue that you are having.
0505112125.jpg?t=1304648793

 

^ yep.

 

where can i find the connector going into the chts. ???what is it called?

 

CHTS connector, I think...

It's that Yellow-GreenStripe/black wire, I think mine might be spliced/soldered (PO was retard)
Chillin next to the dipstick and spark plugs 5 & 6
Right above your engine badge
0508112017.jpg?t=1304904092
0508112017a.jpg?t=1304904093

 

where can i purchase the connector. not the CHTS but the plug in . what is that connector called ?

 

where is the Fuel Pump Relay switch? which one is it?

 

It is pretty much like a fuel injector connector. So just get one for that, wire it up, and you should be good with that.

 

Yup yup... https://www.zdriver.com/forums/showt...ghlight=MAXIMA

 

did the 79have a CHTS? i know it didnt have a O2 sensor...

 

If it doesn't have a CHTS, it has the coolant temp sensor (exact same sensor, just located in the thermostat housing).

 

Rusty gas tank!

 

The plug is called an EV-1 or a Bosch EV-1....

 

@borini63 ...how could it be a rusty gastank?

 

Rust chunks would clog up your fuel filter and starve the engine of fuel. It's possible, but your problem sounds different.



What's the condition of your distributor? Is the module on it damaged? When's the last time you changed your cap and rotor? Is your cap cracked or something? Before I started my engine swap I really let things go to **** under the hood because I knew the old motor was going away, but at one point I started getting steam near the distributor from the thermostat housing and it got the system all wet and would completely lose ignition after 2200 RPM (which was not fun on the 15 mile trip I had to get the car home that day). No spark after a specific RPM range sounds like a distributor problem to me.

 

Its not the fuel tank. i replaced the chts and its still sputtering. could it be the EGR?? i feel like im running out of things to check and replace...

 

Does it pop and sputter through the intake side, or does it sputter coming out the exhaust? These cars also notorious for bad ecu contacts. Try cleaning the contact, and jiggling the wires to see if that helps. Do you have any vacuum leaks?