Engine decoding question

The place to discuss problems and routine maintenance questions and tips that are NOT specifically diesel-related.
bosco1961
Regular Member
Posts: 15
Joined: Wed Oct 02, 2019 12:21 pm
Location: Idaho
Isuzu vehicle(s): 1989 Isuzu 2.3 2x4

Engine decoding question

Postby bosco1961 » Sat Oct 05, 2019 12:16 pm

Hello,

I have a question about the 2.6 4 cylinder and I was wondering if they have a 4zD1 on the side of the block or is it just a 2.3 motor? The motor is out of a 91 Trooper and wondered if it was a 2.3 instead of a 2.6

oldestisuzuist
Regular Member
Posts: 1378
Joined: Tue Oct 07, 2008 9:10 pm
Location: N W Arkansas

Re: Engine decoding question

Postby oldestisuzuist » Sat Oct 05, 2019 4:19 pm

2.6 engine designator is 4ZE1, 4ZD1 is a 2.3
'91 Troopers only came with the 2.6 4cyl or 2.8 GM 6cyl engines, both fuel injected. If the engine in question is the stock engine it's a 2.6, if it has "4ZD1" cast into the block it's a 2.3 & not stock to a '91 Trooper.
'78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, body ROUGH, bought new 12/4/78. A pre-P'up?
'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch.

bosco1961
Regular Member
Posts: 15
Joined: Wed Oct 02, 2019 12:21 pm
Location: Idaho
Isuzu vehicle(s): 1989 Isuzu 2.3 2x4

Re: Engine decoding question

Postby bosco1961 » Sat Oct 05, 2019 4:34 pm

Yeah maybe somebody put the 2.3 block in there and it does have fuel injection. So is the bore and stroke different on the 2.6 versus the 2.3?

bosco1961
Regular Member
Posts: 15
Joined: Wed Oct 02, 2019 12:21 pm
Location: Idaho
Isuzu vehicle(s): 1989 Isuzu 2.3 2x4

Re: Engine decoding question

Postby bosco1961 » Sat Oct 05, 2019 4:41 pm

Thank you for responding, is there any way to tell what year the motor is on the Block?

oldestisuzuist
Regular Member
Posts: 1378
Joined: Tue Oct 07, 2008 9:10 pm
Location: N W Arkansas

Re: Engine decoding question

Postby oldestisuzuist » Sat Oct 05, 2019 5:07 pm

bosco1961 wrote:Yeah maybe somebody put the 2.3 block in there and it does have fuel injection. So is the bore and stroke different on the 2.6 versus the 2.3?

Yes.
2.6 also has bigger valves unless the 2.3 is the Impulse version.
'78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, body ROUGH, bought new 12/4/78. A pre-P'up?
'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch.

User avatar
JoeIsuzu
Site Admin
Posts: 20579
Joined: Thu Aug 19, 2004 9:11 am
Location: Germantown (next to Elvistown), TN
Isuzu vehicle(s): Original owner, '83 LS Diesel, 5-spd, 2wd, Long Bed, restoration in progress!

Re: Engine decoding question

Postby JoeIsuzu » Sat Oct 05, 2019 7:16 pm

And there were SOME 2.3 (4ZD1) engines with fuel injection -- from the factory.

Jack

bosco1961
Regular Member
Posts: 15
Joined: Wed Oct 02, 2019 12:21 pm
Location: Idaho
Isuzu vehicle(s): 1989 Isuzu 2.3 2x4

Re: Engine decoding question

Postby bosco1961 » Mon Oct 07, 2019 7:48 am

I think 1990 was the first year of fuel injection on the 2.3 but I could be wrong

User avatar
JoeIsuzu
Site Admin
Posts: 20579
Joined: Thu Aug 19, 2004 9:11 am
Location: Germantown (next to Elvistown), TN
Isuzu vehicle(s): Original owner, '83 LS Diesel, 5-spd, 2wd, Long Bed, restoration in progress!

Re: Engine decoding question

Postby JoeIsuzu » Mon Oct 07, 2019 1:17 pm

bosco1961 wrote:I think 1990 was the first year of fuel injection on the 2.3 but I could be wrong

Some years ago, I pulled a transmission from a 2wd Amigo that had a 2.3 with FI. I vaguely remember it as an '89 model, but I can't be 100% sure.

Jack

Red Truck
Regular Member
Posts: 115
Joined: Wed Sep 18, 2013 7:10 pm
Location: Vader, WA

Re: Engine decoding question

Postby Red Truck » Fri Oct 11, 2019 1:51 pm

bosco1961 wrote:Thank you for responding, is there any way to tell what year the motor is on the Block?


I should've responded earlier, but if it's any help: My door panel 'date of manufacture' is August 1986 (for the '87 model year), and my engine block number is 322687. It's a 4ZD1 2.3 liter, and I'm positive it's orig-o. Maybe this will assist in building a time-line for narrowing down the birthdate of your motor.
'87 Isuzu pickup 2.3 gas, 5spd, 4WD