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Old 04-20-2019, 02:14 AM   #1
Wardog23
 
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Default 1987.5 Nissan Z24i idle problem

Hello I have had my nissan truck for a year and a half now and it always made a lol tick and I got my timing chain replaced and it was timed so me and my neighbor got the distributor timing right and the tick remained I figured it came from the head with the rockers banging on the cam I have set the valve lash multiple times but no change I check the codes and I'm getting 12-mass air flow. 23-idle switch. 34-knock sensor. 45-injector leak. 51-injector circuit. I'm thinking head and tbi rebuild any suggestions? 220,000 miles
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Old 04-20-2019, 02:14 AM   #2
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Please my baby needs a wash ��
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Old 04-20-2019, 07:14 PM   #3
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A little tick? Can you describe this mystery sound in more detail? You really didn't say anything about the noise at all. It could be just a loose exhaust manifold.

You should address the error codes, though.

12-mass air flow: If you are getting this error, your truck probably runs like crap around 2500 RPM because the ECU is going into Limp Mode. You can clean the MAF and make sure it is getting a good ground. If the heating element wire has burned out, you would need to replace it.

23-idle switch: *

34-knock sensor: These are cheap. If you have the Z24i, it should be easy to get to (not so for the VG30 V6 engine).

45-injector leak: *

51-injector circuit: *

* The idle switch, injector and injector circuit are built into the throttle body, so just replace that to knock out 3 error codes.
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Old Yesterday, 05:49 AM   #4
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Where is the MAF sensor located on these older d21? I have a 1986 w/ same problem. It won't go over 35mph. And it goes into "limp mode" never had any problems before. This was out of nowhere, and now I've replaced the catalytic converter, fuel filter, air filter..
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Old Yesterday, 01:24 PM   #5
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The MAF is on the throttle body right under the air cleaner.
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Old Yesterday, 02:30 PM   #6
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Quote:
Originally Posted by Bwreck View Post
Where is the MAF sensor located on these older d21? I have a 1986 w/ same problem. It won't go over 35mph. And it goes into "limp mode" never had any problems before. This was out of nowhere, and now I've replaced the catalytic converter, fuel filter, air filter..
If you don't have a Service Manual, you should download the free 1989 version, which is almost identical to your truck (error code numbering is different):

d21_truck_1989.pdf

These are all on the throttle body.




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Old Yesterday, 04:36 PM   #7
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Thanks a bunch deerhurst, you have been very helpful! I'm gonna switch out the old MAF sensor and then restart my ECM if that doesn't work.
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Old Yesterday, 06:16 PM   #8
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Me? Helpful? Got you fooled!! Haha!



I'm not sure what I did.



Be careful with the MAF. That little wire is very sensitive.
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