Go Back   Infamous Nissan - Hardbody / Frontier Forums > Model Specific > Hardbody Forum (D21)

Reply
 
Thread Tools Display Modes
Old 12-29-2020, 12:43 AM   #41
Hardbody92
 
Hardbody92's Avatar
 
Join Date: Jan 2013
Location: South West Florida
Posts: 924
Vehicle: 1992 hardbody
Thanks: 346
Thanked 121 Times in 113 Posts
Default

My carbed 89 pathfinder wown't rev past 3k and runs out of power at 50 miles per hour. What could be the problem? Is the ECU not happy with the carb?
__________________
What do you get from a nervous cow.... A milk-shake
Hardbody92 is offline   Reply With Quote
Old 12-29-2020, 01:34 AM   #42
89'HBV6
Ol'school Geek
 
89'HBV6's Avatar
 
Join Date: Mar 2020
Location: Washington State
Posts: 520
Vehicle: 89' D21 KC SE V6 5spd 2WD - 87' D21 KC SE V6 5spd 2WD
Thanks: 534
Thanked 130 Times in 113 Posts
Default

Clogged jet? Got a good inline filter?
89'HBV6 is offline   Reply With Quote
Old 12-29-2020, 02:59 AM   #43
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 51
Posts: 10,488
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,675
Thanked 1,522 Times in 1,336 Posts
Default

Failsafe Mode is supposed to be around 2500 RPM, so maybe it has a code.
__________________
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 12-30-2020, 02:05 AM   #44
Hardbody92
 
Hardbody92's Avatar
 
Join Date: Jan 2013
Location: South West Florida
Posts: 924
Vehicle: 1992 hardbody
Thanks: 346
Thanked 121 Times in 113 Posts
Default

Quote:
Originally Posted by 89'HBV6 View Post
Clogged jet? Got a good inline filter?
Everything is new.
__________________
What do you get from a nervous cow.... A milk-shake
Hardbody92 is offline   Reply With Quote
Old 12-30-2020, 07:03 PM   #45
Stinky
 
Join Date: Nov 2019
Location: Whitewater, CO
Posts: 64
Vehicle: 86 2wd 720, 86 4x4D21
Thanks: 0
Thanked 5 Times in 5 Posts
Default

Somebody mentioned, "why doesnt somebody make a Tbi?"

Holley does...the Sniper line. They make 4 dif 2 bbls and a 1 barrel. They are all designed as replacements for 60s and 70s US vehicles AND they are not smog legal...but neither is your carb.

The 1 bbls is good for 150 or 175 hp. Youd have to make an adapter, but the Holley type 2bbl has adapters available for it.

Summit has them...they start at about 850
Stinky is offline   Reply With Quote
Old 12-30-2020, 07:28 PM   #46
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 51
Posts: 10,488
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,675
Thanked 1,522 Times in 1,336 Posts
Default

Quote:
Originally Posted by Stinky View Post
Somebody mentioned, "why doesnt somebody make a Tbi?"

Holley does...the Sniper line. They make 4 dif 2 bbls and a 1 barrel. They are all designed as replacements for 60s and 70s US vehicles AND they are not smog legal...but neither is your carb.

The 1 bbls is good for 150 or 175 hp. Youd have to make an adapter, but the Holley type 2bbl has adapters available for it.

Summit has them...they start at about 850
Looks like there are about 10 of them available (without the kits)

https://www.summitracing.com/search/...hrottle-bodies
__________________
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 01-05-2021, 06:06 PM   #47
travisg96
 
Join Date: Sep 2020
Location: OR
Posts: 70
Vehicle: 1986 D21 Long Bed HD
Thanks: 1
Thanked 10 Times in 8 Posts
Default

The ECU should not even make a difference if you are using a carb and replace the distributor with a manual one like a DUI or a Saudi distributor
travisg96 is offline   Reply With Quote
Old 01-05-2021, 06:20 PM   #48
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 51
Posts: 10,488
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,675
Thanked 1,522 Times in 1,336 Posts
Default

Quote:
Originally Posted by travisg96 View Post
The ECU should not even make a difference if you are using a carb and replace the distributor with a manual one like a DUI or a Saudi distributor
Except in your truck, the ECU monitors air flow and controls fuel and spark.

Once you go carb, the ECU will be in error mode all the time.
__________________
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
Thanked by:
Hardbody92 (01-06-2021)
Old 01-06-2021, 12:07 AM   #49
travisg96
 
Join Date: Sep 2020
Location: OR
Posts: 70
Vehicle: 1986 D21 Long Bed HD
Thanks: 1
Thanked 10 Times in 8 Posts
Default

Yes but air flow won't matter anymore and the ECU doesn't control the spark anymore. What would the ECU even need to do once you convert to a carb and a manual distributor, and maybe rewire the fuel pump not to be controlled by the ECU.
travisg96 is offline   Reply With Quote
Old 01-06-2021, 02:35 AM   #50
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 51
Posts: 10,488
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,675
Thanked 1,522 Times in 1,336 Posts
Default

Quote:
Originally Posted by travisg96 View Post
Yes but air flow won't matter anymore and the ECU doesn't control the spark anymore. What would the ECU even need to do once you convert to a carb and a manual distributor, and maybe rewire the fuel pump not to be controlled by the ECU.
With the CEL on, it won't pass emissions. Your MAF (and probably O2 sensors) will never be accurate, so the ECU will always be in limp mode.

Your best bet will be to rip out the ECU if you are going to do all that.

Then you are going to need to find a way to monitor the fuel tank, speedometer, tachometer, and some probably other things.

These trucks are tied to the ECU pretty hard. The 1986.5 isn't so much. The 1987 to 1989 is more, but it can get by without it. Up to 1995 it gets difficult. In 1996, it went OBD2 and got a lot more dependent on the ECU for engine management.
__________________
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
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 07:41 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.