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

Reply
 
Thread Tools Display Modes
Old 10-11-2020, 09:27 PM   #1
MidnightOil
 
MidnightOil's Avatar
 
Join Date: Apr 2020
Location: FL
Posts: 67
Vehicle: 1997 D21
Thanks: 31
Thanked 22 Times in 12 Posts
Default Surging after rebuild

Hi Folks,

I just put the engine back together on my D21/KA24E - and after wrestling with the timing, it's finally running. However, the engine won't drop below 2000rpm at idle and is surging (about one surge per second). The only code that it's throwing is for an air intake temperature sensor - but that has been there for a long time.

The rebuild on the engine included new pistons, new timing chain, rebuilt cylinder head - and I put in a new fuel pump and fuel filter. I just replaced the MAF sensor but that did not help.

Does anyone have a suggestion as to the cause of a rapid surge at 2000rpm?

Thanks!
MidnightOil is offline   Reply With Quote
Old 10-11-2020, 10:31 PM   #2
VOTS95
 
VOTS95's Avatar
 
Join Date: Apr 2015
Location: Phoenix
Posts: 469
Vehicle: 95 XE V6 4x4 5 Sp
Thanks: 48
Thanked 124 Times in 96 Posts
Default

Double check all electrical and hose connections. Did you bleed the air from the coolant system?

VOTS
VOTS95 is offline   Reply With Quote
Thanked by:
amdilligaf1 (10-15-2020), MidnightOil (10-12-2020)
Old 10-11-2020, 10:48 PM   #3
MidnightOil
 
MidnightOil's Avatar
 
Join Date: Apr 2020
Location: FL
Posts: 67
Vehicle: 1997 D21
Thanks: 31
Thanked 22 Times in 12 Posts
Default

I did not bleed the coolant system (but will do so now). Hoses and electrical connections were all marked and appear to be where they belong. I tried spraying propane around to check for vacuum leaks. I did find and replace several rotted vacuum hoses during the rebuild - including the one that goes from the EGR valve to EGRC-BPT valve. All the rest look ok based on a visual inspection.
MidnightOil is offline   Reply With Quote
Old 10-12-2020, 02:19 AM   #4
PorknBeans
 
Join Date: Dec 2019
Location: Where I can see the air I breathe...
Posts: 147
Vehicle: Original owner of my 3-pdl 1997 Nissan Hardbody King Cab XE 2WD 5-spd.
Thanks: 8
Thanked 45 Times in 33 Posts
Default

If you purchased the MAF from A1AA Auto. Your engine will surge. I notified them of this problem from the batch of MAF's they sell. They replied back that they would notify the Engineering Dept. of this issue. I purchased a different one from another site(don't recall the name). But it was the exact same surging problem. I bought one from both places late last year and it caused the engine to surge like you describe yours is doing. But those 2 MAF's caused my engine to run even worse than before I took out the original MAF of 23 yrs! My surging issue was at idle speed.
PorknBeans is offline   Reply With Quote
Thanked by:
amdilligaf1 (10-15-2020), MidnightOil (10-12-2020)
Old 10-12-2020, 03:23 AM   #5
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 51
Posts: 10,225
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,627
Thanked 1,440 Times in 1,268 Posts
Default

Is the air going through the MAF? If you have the air cleaner lid open, air is not going through the MAF.
__________________
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:
MidnightOil (10-12-2020)
Old 10-12-2020, 11:04 AM   #6
MidnightOil
 
MidnightOil's Avatar
 
Join Date: Apr 2020
Location: FL
Posts: 67
Vehicle: 1997 D21
Thanks: 31
Thanked 22 Times in 12 Posts
Default

I got the MAF sensor from Autozone (duralast). The engine surges with the air cleaner lid open and also when it's closed.
MidnightOil is offline   Reply With Quote
Old 10-12-2020, 11:30 AM   #7
alabama_lowlife
Owner and Administrator
 
alabama_lowlife's Avatar
 
Join Date: Sep 2008
Location: jack, alabama
Age: 41
Posts: 10,275
Vehicle: 2012 370Z, 1970 Datsun 521, 1995 Nissan Hardbody x2
Thanks: 943
Thanked 2,032 Times in 1,671 Posts
Default

Look for a vacuum leak, especially between gasketed mating surfaces like the intake manifold and cylinder head
__________________
alabama_lowlife is offline   Reply With Quote
Thanked by:
MidnightOil (10-12-2020)
Old 10-12-2020, 01:32 PM   #8
MidnightOil
 
MidnightOil's Avatar
 
Join Date: Apr 2020
Location: FL
Posts: 67
Vehicle: 1997 D21
Thanks: 31
Thanked 22 Times in 12 Posts
Default

Yep - I tried using propane, but no joy finding a leak. I'm going to make one of those smoker leak finding gizmos. I see a little exhaust smoke coming from the lower exhaust manifold, so maybe the EGR tube is leaking.

One of the drawbacks to working from home is that the temptation to work on my D21 is always there 24hrs a day. (must. stop. procrastinating).
MidnightOil is offline   Reply With Quote
Old 10-12-2020, 08:23 PM   #9
PorknBeans
 
Join Date: Dec 2019
Location: Where I can see the air I breathe...
Posts: 147
Vehicle: Original owner of my 3-pdl 1997 Nissan Hardbody King Cab XE 2WD 5-spd.
Thanks: 8
Thanked 45 Times in 33 Posts
Default

A smoke machine was my next suggestion to you.

I need one as well. So need to find the time to make one.
PorknBeans is offline   Reply With Quote
Thanked by:
MidnightOil (10-12-2020)
Old 10-12-2020, 09:10 PM   #10
SBJ
Total Buzzkill
 
Join Date: Nov 2016
Location: OR
Posts: 2,883
Vehicle: '90 D21 4cyl 5spd 2wd
Thanks: 320
Thanked 505 Times in 448 Posts
Default

Quote:
Originally Posted by PorknBeans View Post
A smoke machine was my next suggestion to you.

I need one as well. So need to find the time to make one.
Now is the time of year to jump on it...go to the Halloween store and pick up one of those cheapo fog machines. I wouldn't want to put that kind of pressure into the EVAP system but for manifold vacuum leaks it'll work just fine.
SBJ is offline   Reply With Quote
Thanked by:
amdilligaf1 (10-15-2020), MidnightOil (10-12-2020)
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 11:17 PM.


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