ITec to Weber carb

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ITec to Weber carb

Postby kerazy » Sat Mar 13, 2021 6:14 pm

I have a 1988 Trooper 2.6 5 speed manual. I have completely rebuilt the engine and had head redone at machine shop. I want to remove the Itec and install a Weber carb. What is the best way to do this? I know many of you have done this and would appreciate any advice. Thanks and best wishes....
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Re: ITec to Weber carb

Postby itsmehb » Sat Mar 13, 2021 10:33 pm

What I did when I did my 89 was to first aquire all the parts I thought I would need. I followed member, Shooters tutorial. I'll try to find the link. You'll need the Weber, An intake from a 2.3 along with the distributor and mounting plate. Also an Electric fuel pump and maybe a FPR. I say maybe because I'm running mine without one following an article I read when using a carter pump. You'll have to rewire the input to the distributor, coil and tach. This is not necessary, but I also used a throttle cable from a 2.3. There a little shorter and easier to work with. I had to make a bracket for the cable. Also have to make 3 plates to block off ports on the intake you will not be using

https://www.racetep.com/manufacturer/ca ... pumps.html

This is the article I used for fuel pump guidance. Also best to drop the tank and remove the oem pump

https://www.planetisuzoo.com/viewtopic.php?f=1&t=114578

Some more info plus Shooters tutorial Also you should have a filter between the tank and pump and the pump should be mounted under the car near the tank. I mounted mine near where the original fuel filter was. Also the wires to the tank pump run right by this area and can be spliced into and used. This assures the original protection incase of an accident, the alternator will not power the pump. If you hard wire the pump wire in protection from an accident like an oil pressure switch.
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2000 Amigo, 2.2 5 speed(sold)
1985 Trooper 1.9 4 speed (sent back to KS)
1989 Trooper RS 2.6 5 spd. Red

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Re: ITec to Weber carb

Postby kerazy » Sun Mar 14, 2021 9:09 am

Thank you very much for this info. I really do appreciate the effort you took to post your experience. Best wishes......Michael
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Re: ITec to Weber carb

Postby islandscrub » Fri May 14, 2021 8:45 am

I was looking at how I would wire up my fuel pump for my weber conversion and wondered why the heck the thing was connected to the oil pressure switch and alternator. I totally forgot about the emergency cutoff included on the efi 2.6L! I'll have to do my best to copy the setup on my stock 91' carbed pickup..
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4ZD1 2.3L EFI (iTec)

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Re: ITec to Weber carb

Postby giusedtobe » Fri May 14, 2021 8:54 am

kerazy wrote:I have a 1988 Trooper 2.6 5 speed manual. I have completely rebuilt the engine and had head redone at machine shop. I want to remove the Itec and install a Weber carb. What is the best way to do this? I know many of you have done this and would appreciate any advice. Thanks and best wishes....


I was planning on doing this with mine as well but since you have to acquire a fair amount of not cheap parts I decided to keep the I-Tec unless it caused me problems. So far so good. Had the injectors rebuilt by a shop in NY state for about $60-$70 including shipping them there and back. As far as I am concerned, I will keep the benefit of the fuel injection unless it becomes problematic. Start a thread if you do the conversion.
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Re: ITec to Weber carb

Postby kerazy » Fri May 14, 2021 11:37 am

I made the same decision. I went with the I-tec. I will see how it goes. I am still putting my Trooper back together. I have rebuilt or replaced most everything. The head has been to the machine shop and the lower has also been completely redone. Now it is up to me to finish the job. Best wishes....
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Re: ITec to Weber carb

Postby giusedtobe » Fri May 14, 2021 12:22 pm

kerazy wrote:I made the same decision. I went with the I-tec. I will see how it goes. I am still putting my Trooper back together. I have rebuilt or replaced most everything. The head has been to the machine shop and the lower has also been completely redone. Now it is up to me to finish the job. Best wishes....


Did pretty much the same a year ago. I rebuilt it early spring 2020 but did not get the engine back in until September................I'm slow Lol

You can always bling up your I-Tec if you like wasting time on the unimportant stuff.
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Re: ITec to Weber carb

Postby islandscrub » Fri May 14, 2021 2:26 pm

mine doesnt have the fancy lettering on it..
1995 Isuzu Pickup
4ZD1 2.3L EFI (iTec)

1994 Isuzu Pickup 4x4
4ZE1 2.6L EFI (iTec)
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Re: ITec to Weber carb

Postby Enemigo » Fri May 14, 2021 3:09 pm

Add your own lettering. Go fancy and do it in cursive.
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Re: ITec to Weber carb

Postby DSUZU » Fri May 14, 2021 4:26 pm

islandscrub wrote:mine doesnt have the fancy lettering on it..
No, your 1995 doesn't have an "ITEK". It's still the basic ITEK design, but with a round throttle body, different heads (combustion chamber shape) and pistons. It also uses different injectors. Dennis
1991 LS Trooper 2.8 V6 5 speed conversion (Sold)
1989 LS Spacecab 2.6 5 speed 4x4 manual hubs, Rodeo torsion bars, extended shackles, 2" lift, K&N air filter (drop in), dump bed conversion, burgundy interior change, warn brush bar. Engine is bored .020 oversize and upgraded to 1994 pistons, head and EFI system.
Previously owned: 1987 Trooper II LS, 1989 Trooper (parts only), 1994 Trooper 3.2 Auto, 1997 Rodeo 2.6 5 speed, 1993 shortbed pickup 2.3 (project - sold) 1992 Rodeo 4x4 LS (parts car, devoured by Spacecab needs) plus some 70 plus other non Isuzu vehicles over the years. 1994 Amigo devoured to provide head and EFI system.
Heavily damaged by engine compartment fire while driving on March 24th 2018, condemned by insurance company and taken on March 30th 2018 :cry:.

https://forum.planetisuzoo.com/viewtopic.php?f=15&t=64060
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Re: ITec to Weber carb

Postby islandscrub » Fri May 14, 2021 8:40 pm

Which heads are better? I have a 91 2.3 carbed, i assume the 94. 2.6 and 95 2.3 itec i have are the same heads.. ALSO the 95 head doesn’t have air injection ports!
1995 Isuzu Pickup
4ZD1 2.3L EFI (iTec)

1994 Isuzu Pickup 4x4
4ZE1 2.6L EFI (iTec)
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Re: ITec to Weber carb

Postby DSUZU » Fri May 14, 2021 9:01 pm

The 95 2.3 head, I am not sure about. The 94 2.6 will have the heart shaped combustion chambers. IIRC, putting this head on a pre 1994 (1993?) 2.6 will give a higher compression ratio (more power) but may require higher octane fuel or some serious timing modification.
Certain earlier heads were a weaker casting. I believe there is a casting number cast into the back of the head and you want a number 4 or 5. Dennis
1991 LS Trooper 2.8 V6 5 speed conversion (Sold)
1989 LS Spacecab 2.6 5 speed 4x4 manual hubs, Rodeo torsion bars, extended shackles, 2" lift, K&N air filter (drop in), dump bed conversion, burgundy interior change, warn brush bar. Engine is bored .020 oversize and upgraded to 1994 pistons, head and EFI system.
Previously owned: 1987 Trooper II LS, 1989 Trooper (parts only), 1994 Trooper 3.2 Auto, 1997 Rodeo 2.6 5 speed, 1993 shortbed pickup 2.3 (project - sold) 1992 Rodeo 4x4 LS (parts car, devoured by Spacecab needs) plus some 70 plus other non Isuzu vehicles over the years. 1994 Amigo devoured to provide head and EFI system.
Heavily damaged by engine compartment fire while driving on March 24th 2018, condemned by insurance company and taken on March 30th 2018 :cry:.

https://forum.planetisuzoo.com/viewtopic.php?f=15&t=64060
City of St Petersburg (Fl) Fleet Maintenance 8/23/83 - 12/4/2018 (Retired). Started new job 6/4/2019. Was retired, now just tired.

If your wife has 5.00, and you have 20.00, your wife has...25.00

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Re: ITec to Weber carb

Postby islandscrub » Sat May 15, 2021 2:19 am

Cool, thanks !

I'm planning on putting the whole 1994 2.6L into the 9'1 pup with a weber, though I am flexible on keeping the itec. The issue is I'd have to spend more $$ on the itec parts (replace the questionable/bad stuff) whereas I already have the weber and all the other partsI need to get it going.
1995 Isuzu Pickup
4ZD1 2.3L EFI (iTec)

1994 Isuzu Pickup 4x4
4ZE1 2.6L EFI (iTec)
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Re: ITec to Weber carb

Postby giusedtobe » Sat May 15, 2021 11:48 am

DSUZU wrote:The 95 2.3 head, I am not sure about. The 94 2.6 will have the heart shaped combustion chambers. IIRC, putting this head on a pre 1994 (1993?) 2.6 will give a higher compression ratio (more power) but may require higher octane fuel or some serious timing modification.
Certain earlier heads were a weaker casting. I believe there is a casting number cast into the back of the head and you want a number 4 or 5. Dennis



That's interesting. I topped off my tank yesterday(about half) and all they had was regular unleaded. It pinged and knuckled like mad under load going up hills at highway speed. Put a bottle of octane boost in and all was well. I had been putting high octane gas in it and this was not a problem. Mine is the heart shaped (clearwater head) and my compression was around 190 psi per. Do you think I am stuck burning high test or should I back off the timing a bit? It's roughly 12 degrees BTDC.

Sorry for the thread hijack
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Re: ITec to Weber carb

Postby islandscrub » Sat May 15, 2021 12:21 pm

giusedtobe wrote:
DSUZU wrote:The 95 2.3 head, I am not sure about. The 94 2.6 will have the heart shaped combustion chambers. IIRC, putting this head on a pre 1994 (1993?) 2.6 will give a higher compression ratio (more power) but may require higher octane fuel or some serious timing modification.
Certain earlier heads were a weaker casting. I believe there is a casting number cast into the back of the head and you want a number 4 or 5. Dennis



That's interesting. I topped off my tank yesterday(about half) and all they had was regular unleaded. It pinged and knuckled like mad under load going up hills at highway speed. Put a bottle of octane boost in and all was well. I had been putting high octane gas in it and this was not a problem. Mine is the heart shaped (clearwater head) and my compression was around 190 psi per. Do you think I am stuck burning high test or should I back off the timing a bit? It's roughly 12 degrees BTDC.

Sorry for the thread hijack


I figure if its fixed by getting higher octane, leave the timing alone. And yes, apologies for the thread highjacking!
1995 Isuzu Pickup
4ZD1 2.3L EFI (iTec)

1994 Isuzu Pickup 4x4
4ZE1 2.6L EFI (iTec)
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Re: ITec to Weber carb

Postby DSUZU » Sat May 15, 2021 12:39 pm

I'd bring it up to 8 degrees and see how that works. I'm not a fan of high octane (cheapo). Not really a thread hijack as it was related to the existing discussion. Dennis
1991 LS Trooper 2.8 V6 5 speed conversion (Sold)
1989 LS Spacecab 2.6 5 speed 4x4 manual hubs, Rodeo torsion bars, extended shackles, 2" lift, K&N air filter (drop in), dump bed conversion, burgundy interior change, warn brush bar. Engine is bored .020 oversize and upgraded to 1994 pistons, head and EFI system.
Previously owned: 1987 Trooper II LS, 1989 Trooper (parts only), 1994 Trooper 3.2 Auto, 1997 Rodeo 2.6 5 speed, 1993 shortbed pickup 2.3 (project - sold) 1992 Rodeo 4x4 LS (parts car, devoured by Spacecab needs) plus some 70 plus other non Isuzu vehicles over the years. 1994 Amigo devoured to provide head and EFI system.
Heavily damaged by engine compartment fire while driving on March 24th 2018, condemned by insurance company and taken on March 30th 2018 :cry:.

https://forum.planetisuzoo.com/viewtopic.php?f=15&t=64060
City of St Petersburg (Fl) Fleet Maintenance 8/23/83 - 12/4/2018 (Retired). Started new job 6/4/2019. Was retired, now just tired.

If your wife has 5.00, and you have 20.00, your wife has...25.00

"Water is one of the greatest essentials of life. Without water, you can't make coffee."

Forget the "free education". Why waste time. Just give me the "FREE INCOME".
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Re: ITec to Weber carb

Postby giusedtobe » Sun May 16, 2021 1:19 pm

DSUZU wrote:I'd bring it up to 8 degrees and see how that works. I'm not a fan of high octane (cheapo). Not really a thread hijack as it was related to the existing discussion. Dennis


Thanks, I was thinking I might try that as well with gas prices going nuts. The dang bottle of octane boost was freaking $9 :shock:
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