Go Back   Infamous Nissan - Hardbody / Frontier Forums > Tech Area > Engine and Drivetrain

Reply
 
Thread Tools Display Modes
Old 09-03-2018, 02:45 AM   #21
knksHB
 
Join Date: Sep 2017
Location: Kahaluu,Hi
Posts: 7
Vehicle: Nissan,d21,1991
Thanks: 9
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by cadillacdude1975 View Post
check the timing. if the previous owner did crazy things to the ignition system, it is quite possible the timing may be off as well. then i would remove the seat and check the ECM for any stored codes. information on code reading is in the following thread named ECU / Check engine light - Diagnostic Codes


and welcome to IN.
Thanks man! I found out the problem, theres that black circle thing that goes with the egr. It sits on the fender right in back for the headlight. I pulled it out and the whole back part of it was rusted out. Took out all the egr stuff, pinched the 2 pipes and capped all the vacuum lines and now it runs CHERRY! Thanks for the input!
knksHB is offline   Reply With Quote
Old 09-03-2018, 02:48 AM   #22
knksHB
 
Join Date: Sep 2017
Location: Kahaluu,Hi
Posts: 7
Vehicle: Nissan,d21,1991
Thanks: 9
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by alabama_lowlife View Post
Id check the fuel filter, test to see if you have good fuel pressure too.
I found the problem. It was with the egr stuff. Now its time for timing chain and a WHOLE bunch of other fun stuff. Lol!
knksHB is offline   Reply With Quote
Old 09-23-2018, 05:56 AM   #23
knksHB
 
Join Date: Sep 2017
Location: Kahaluu,Hi
Posts: 7
Vehicle: Nissan,d21,1991
Thanks: 9
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by jp2code View Post
A bad coolant temperature sensor can cause all sorts of weird problems. Rarely they completely fail. Usually, they start acting wrong inside. That's one of the things that makes them hard to diagnose when they mess up.

I say get a new one. They aren't expensive.
Will a bad coolant sensor still work? My temp gauge on the cluster still moves.
knksHB is offline   Reply With Quote
Old 09-23-2018, 06:21 AM   #24
SBJ
Total Buzzkill
 
Join Date: Nov 2016
Location: OR
Posts: 1,712
Vehicle: '90 D21 4cyl 5spd 2wd
Thanks: 180
Thanked 198 Times in 181 Posts
Default

There are two different coolant temperature sensors. The one with two wires going to it is the one that sends a signal to the ECU. The one with a single wire is for the temperature gauge on the instrument cluster.
SBJ is offline   Reply With Quote
Old 09-23-2018, 08:22 AM   #25
knksHB
 
Join Date: Sep 2017
Location: Kahaluu,Hi
Posts: 7
Vehicle: Nissan,d21,1991
Thanks: 9
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by SBJ View Post
There are two different coolant temperature sensors. The one with two wires going to it is the one that sends a signal to the ECU. The one with a single wire is for the temperature gauge on the instrument cluster.
Which one should I try change first?
knksHB is offline   Reply With Quote
Old 09-23-2018, 11:43 AM   #26
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 49
Posts: 8,892
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,296
Thanked 1,107 Times in 977 Posts
Default

Quote:
Originally Posted by knksHB View Post
Will a bad coolant sensor still work? My temp gauge on the cluster still moves.
It can. It depends on why it went bad. If it is a corroded contact, it could only work intermittently. Or, the material inside that the sensor uses for measuring resistance can change properties as it gets old. In that case, it would still show as working, but every reading it makes would be off.

Quote:
Originally Posted by SBJ View Post
There are two different coolant temperature sensors. The one with two wires going to it is the one that sends a signal to the ECU. The one with a single wire is for the temperature gauge on the instrument cluster.
Quote:
Originally Posted by knksHB View Post
Which one should I try change first?
The 2 wire sensor going to the ECU would cause the code and cause the engine to not run correctly. The 1 wire going to the instrument cluster is just for you to look at while driving. If the reading on the instrument cluster always shows that the truck is COLD, it would need to be replaced.
__________________
Joe (not a mechanic!) Don't have an account? EMAIL ME
Factory Service Manuals: https://www.nicoclub.com/FSM/Hardbody/
Walk-through: Checking Nissan Trouble Codes
1994 VG30E to VG33E with H256 Cams

jp2code is offline   Reply With Quote
Old 09-24-2018, 12:53 AM   #27
GipsyRey
 
Join Date: Sep 2018
Location: Volusia Co, FL
Posts: 7
Vehicle: 1993 Nissan D21 single cab & 1996 Nissan D21 king cab
Thanks: 1
Thanked 1 Time in 1 Post
Default

Where is the sensor to the ECU located?
GipsyRey is offline   Reply With Quote
Old 09-24-2018, 01:09 AM   #28
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 49
Posts: 8,892
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,296
Thanked 1,107 Times in 977 Posts
Default

Quote:
Originally Posted by GipsyRey View Post
Where is the sensor to the ECU located?
If it's like my V6, both are located on the aluminum cover that holds the thermostat in place.
__________________
Joe (not a mechanic!) Don't have an account? EMAIL ME
Factory Service Manuals: https://www.nicoclub.com/FSM/Hardbody/
Walk-through: Checking Nissan Trouble Codes
1994 VG30E to VG33E with H256 Cams

jp2code is offline   Reply With Quote
Old 09-24-2018, 04:37 PM   #29
knksHB
 
Join Date: Sep 2017
Location: Kahaluu,Hi
Posts: 7
Vehicle: Nissan,d21,1991
Thanks: 9
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by jp2code View Post
It can. It depends on why it went bad. If it is a corroded contact, it could only work intermittently. Or, the material inside that the sensor uses for measuring resistance can change properties as it gets old. In that case, it would still show as working, but every reading it makes would be off.





The 2 wire sensor going to the ECU would cause the code and cause the engine to not run correctly. The 1 wire going to the instrument cluster is just for you to look at while driving. If the reading on the instrument cluster always shows that the truck is COLD, it would need to be replaced.

Mahalo for all the insight! Im gonna try change all those sensors.
knksHB is offline   Reply With Quote
Thanked by:
jp2code (09-24-2018)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 08:43 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.