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Old 10-03-2016
emac  emac is offline
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Default swapping older style inlet manifold for newer

hi

any advice accepted

i have a 1994 OBD1 xj cherokee

I've recently bought a later model "horseshoe" style manifold, after doing much reading

the new manifold came with injectors, and as my car has 400,000km on it i thought i would use the new style injectors, from "go-jeeps" site i see i need to remove the tabs on the new injectors etc and then cable tie the connectors

i also see that i need to replace the fuel pressure regulator ( remember OBD1)

and they are available. oh and use my fuel rail

is this it???

i have already had the head serviced and extractors and 2.5 inch system inc cat. converter.

please chime in if you have done this mod.

oh and I'm on top of the fan support issue, actually non issue for me as i have twin electric fans and have cut the mechanical fan boss off.

so I'm thinking bolt it up mod the injectors, use my original throttle body and replace the regulator what do yah reckon.

ewen
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Old 10-03-2016
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Just make sure you remove enough material from fan mount where the power steering pump currently locates, on back of that that top boss. so it does not conflict with the new manifold.
don't forget the washers to space out the powerstering pump like i did.

good luck with it.
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Last edited by rainman; 11-03-2016 at 07:26 AM.
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Old 10-03-2016
Doctor W  Doctor W is offline
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Doesn't the OBD2 injection system run at about 10-12 psi higher pressure???

If it is you might have to swap in OBD2 fuel rails, fuel tank (so as to accomodate new fuel module incorporating pump, filter, regulator and NO return connection) OR disable your current regulator and fit and plumb up a new external adjustable regulator (e.g. Holley)
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Old 11-03-2016
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Quote:
Originally Posted by Doctor W View Post
Doesn't the OBD2 injection system run at about 10-12 psi higher pressure???

If it is you might have to swap in OBD2 fuel rails, fuel tank (so as to accomodate new fuel module incorporating pump, filter, regulator and NO return connection) OR disable your current regulator and fit and plumb up a new external adjustable regulator (e.g. Holley)
or you can put in a fpr that runs at 40/49psi rather than 30/39.
= same pressure on the fuel rail to keep the newer injectors happy.
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Old 11-03-2016
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Yep that's the plan rain man

I see Chinese ones on eBay and apparently hesco do make an adgustable one that mounts in the fuel rail like stock

I might try the Chinese one first and if it works ok great

I guess I'll need to get a fuel pressure gauge to check

I'm planning to use the original obd1 fuel rail
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Old 11-03-2016
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Quote:
Originally Posted by emac View Post
Yep that's the plan rain man

I see Chinese ones on eBay and apparently hesco do make an adgustable one that mounts in the fuel rail like stock

I might try the Chinese one first and if it works ok great

I guess I'll need to get a fuel pressure gauge to check

I'm planning to use the original obd1 fuel rail
just order them from rockauto -part numbers on go jeeps website write up.

also here: http://www.ausjeepoffroad.com/forum/...19&postcount=1

also : Actron Fuel Pressure Test Kit CP7818



good luck with it.
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Old 11-03-2016
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Quote:
Originally Posted by rainman View Post
or you can put in a fpr that runs at 40/49psi rather than 30/39.
= same pressure on the fuel rail to keep the newer injectors happy.
That's exactly what I just did. Installed 777 commo injectors on my OBDI XJ and replaced the OBDI FPR with a 49PSI FPR. I didn't get a Chinese one (trust issues), I got a USA made one shipped to my door for about $70AUD.
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Old 11-03-2016
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I did this swap on mine when it was OBD1, the easiest way was to use the matching power steering bracket as they're vastly different in the way the pump mounts (on an OBD1 the pump mounts to the bracket, OBD2 the pump attaches to the manifold) and as Rainman stated some spacing is required.

Not sure about this cable tie issue for the injectors, doesn't sound right but haven't tried it.

On mine when OBD1 I ran the Throttle Body Spacer as well with OEM injectors and had good results, despite all the internet experts who told me it doesn't work....
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Thanks guys

The cable tie is if I want to use the new style injectors that came with the manifold, the new injectors locking system doesn't match the old existing connectors,

So the tabs on the new injectors need to be removed

My option is to do it this way or continue to use my old injectors, I thought I would give the new ones a shot, means of course with that I need the fpr that allows hire pressure

But I'm more interested in the power steering mounting, go jeep shows using the old bracket but modified to suit, what do you think of that idea

I was surprised when the manifold turned up I expected it to be bare but it had the injectors the fuel rail and the throttle body (which I can't use due to connector layout)

I was originally just going to use my injectors

Thanks for the input, it's much appreciated

Ewen
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