my MAF going bad?
11-20-2007, 10:26 AM
#1
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Join Date: Oct 2006
Posts: 18
my MAF going bad?
okay i don't know if my maf is going bad or what but in the mornings on cold start up my 1983 280zx runs like crap and dies, on initial start up it will idle really low and i have to gas it to keep it running. it take multiple start ups to start and i have to start driving for it to stop dying. after the car is up to operating temps no problems.
please give any input you guys might have on what the problem is. the car is a blast to drive, just annoying when im leaving the parking garage and the car dies and i have to start it and start rolling and reving to keep it going until the car comes up to temp.
please give any input you guys might have on what the problem is. the car is a blast to drive, just annoying when im leaving the parking garage and the car dies and i have to start it and start rolling and reving to keep it going until the car comes up to temp.
11-20-2007, 10:32 AM
#2
Common cold start valve and/or air regulator issue. Searching is your friend. 
https://www.zdriver.com/forums/showt...highlight=COLD
https://www.zdriver.com/forums/showt...highlight=COLD
https://www.zdriver.com/forums/showt...highlight=COLD
The list goes on and on. PS... the 280zx uses an AFM (Air Flow Meter, not MAF (Mass Air Flow sensor)).
https://www.zdriver.com/forums/showt...highlight=COLD
https://www.zdriver.com/forums/showt...highlight=COLD
https://www.zdriver.com/forums/showt...highlight=COLD
The list goes on and on. PS... the 280zx uses an AFM (Air Flow Meter, not MAF (Mass Air Flow sensor)).
11-20-2007, 04:26 PM
#5
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Thread Starter
Join Date: Oct 2006
Posts: 18
Originally Posted by thetremendousti
Hey tell me what you come up with, i have the exact same problem and i even cleaned my MAF and it wasn't that dirty to begin with
hey nismopick in the haynes it says to release the pressure of the fuel system and reference chapter one. i can't find the chapter 1 section that says that. how do i release the pressure? also the cold start valve is pretty expensive is there a way to check to see if mine is still good?
11-20-2007, 07:01 PM
#7
^^^ That, or since the fuel pump relay is a pain to get to, disconnect the fuel pump plug under the hatch mat.
As for testing the cold start valve, it can be a pain, but the easiest way I've found, is to remove it, turn it upside down & put it back on the fuel line. Pressurize the fuel lines, and tap the cold start electrical poles w/ some wires connected to a 9v battery (or cordless drill battery). If you see a spray... well, you know.
*A bad cold start valve usually makes it hard to start the car.
*A bad air regulator will cause the car to run rough when cold. I suggest checking this before the cold start valve.
As for testing the cold start valve, it can be a pain, but the easiest way I've found, is to remove it, turn it upside down & put it back on the fuel line. Pressurize the fuel lines, and tap the cold start electrical poles w/ some wires connected to a 9v battery (or cordless drill battery). If you see a spray... well, you know.
*A bad cold start valve usually makes it hard to start the car.
*A bad air regulator will cause the car to run rough when cold. I suggest checking this before the cold start valve.
11-20-2007, 07:50 PM
#9
Originally Posted by johnwoo
is there a way to check the air regulator?
Diagram:
