91 L98 Injectors-Replacements? What Do I Do?
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Pro
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From: Cleveland Ohio
91 L98 Injectors-Replacements? What Do I Do?
I've had this erratic idle for some time. Cleaned the IAC, checked the TPS, O2 sensor, etc. and finally gave up. Took it to a good shop who checked it out. Today they called and said that 7 of the 8 injectors were bad. If I remember correctly they stated that there should be 10 OEMs at an injector and mine were all over the board. From 6 to 20. They believe that this is what is causing my searching idle. I questioned the smooth operation until the engine warmed up and they stated that this was to be expected as the fuel delivery from the injectors changes after it warms up, closed to open loop (or vice versa). Of course the reason I'm questioning this, is the cost. They want between $1000 & $1500 to replace the injectors. Something about the injector coils being shot and injectors unable to be cleaned and/or fixed like later model injectors. This being the case, what do I do? Where can I buy new injectors at what kind of a price? I'm a pretty good wrench, should I attempt to replace these myself? I suppose you'all would suggest that I replace the EGR valve as long as the plenum is off, also. Again, what do you think? What would you do? Thanks, Frank
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From: Long Island, NY
Re: 91 L98 Injectors-Replacements? What Do I Do? (Frank C)
Of course the reason I'm questioning this, is the cost. They want between $1000 & $1500 to replace the injectors.
You should purchase Ford 24 lbs injectors and install them yourself.
They cost about $200.
Also, in the Summit racing catolog , they have some Accel injectors for less than $300.
All you need to do is remove the plenum and runners to get to the injectors.
Vic
[Modified by Vic'89, 9:40 AM 2/8/2002]
Instructor
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From: Olympia Wa
Re: 91 L98 Injectors-Replacements? What Do I Do? (Frank C)
I also have the hunting spuratic running problem.......:confused: The injectors are the cause. The Accell Injectors are now $399.00 (set of 8) in the Summit Catalog, the dealer wants $120.00 each for the GM O.E.M :eek: .......... I found a set of Accell's at the local speed shop for $299.00. Its not that hard to replace the Injectors, It should take the averarage weekend mechanic a cupple of hours to replace them.
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From: This vette goes to 11 Milford MA
St. Jude Donor '03-'05
Re: 91 L98 Injectors-Replacements? What Do I Do? (Frank C)
. Again, what do you think? What would you do? Thanks, Frank
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From: At the beach in little Rhody
Re: 91 L98 Injectors-Replacements? What Do I Do? (Fastguy)
Change them yourself and allow plenty of time (a whole weekend). You will need plenty of time to clean gasket surfaces. As for the injectors, I am of a different opinion, get the 22#. The RC Engineering injectors are great injectors and the engine will be very balanced, important with a single O2 sensor and batch fired motor.
Be careful on re-assembly as the bolts in the plenum are at an angle. Start each by hand until you know they are in correctly. Leave loose until all are started. Also, there are two runner bolts that are on the inside, towards the rear on the driver's side and towards the front on the passenger side. To get at the passenger side one, you will need to remove the EGR solenoid that is held to the coolant neck.
This is not a hard job to do, just time consuming the first time as gaskets and such will be a mess when you take it apart and since you are dealing with aluminum you have to be careful cleaning the surfaces.
Be careful on re-assembly as the bolts in the plenum are at an angle. Start each by hand until you know they are in correctly. Leave loose until all are started. Also, there are two runner bolts that are on the inside, towards the rear on the driver's side and towards the front on the passenger side. To get at the passenger side one, you will need to remove the EGR solenoid that is held to the coolant neck.
This is not a hard job to do, just time consuming the first time as gaskets and such will be a mess when you take it apart and since you are dealing with aluminum you have to be careful cleaning the surfaces.
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From: Cleveland Ohio
Re: 91 L98 Injectors-Replacements? What Do I Do? (Frank C)
OK, thanks for the opinions and direction. Got a couple of questions. I went to the archives and found that the Ford 24# injectors ($295 my cost locally) seem to work OK except they run rich in open loop and lean out at WOT, apparently. The Accel 22# seem to be the correct choice except quality control seems to be an issue. Some guys complained that they were shipped leakers. What are the RC Engineering injectors and where do you get um at how much. My buddy can get me the GM type for $82 or $84 but that's still pretty healthy...Thanks, Frank
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From: This vette goes to 11 Milford MA
St. Jude Donor '03-'05
Re: 91 L98 Injectors-Replacements? What Do I Do? (Frank C)
If you can wait, there are people that will rebuild them and balance/flow test them for not a lot of money.
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From: Cleveland Ohio
Re: 91 L98 Injectors-Replacements? What Do I Do? (Fastguy)
I could probably wait but I'm under the impression from the garage and the archives that these can't be rebuilt as these 91's are early models compared to 93 or 94, whenever they changed them. I think I'll just order the new ones from Summit and be done with it. They want $250 delivered..Thanks, Frank
[Modified by Frank C, 1:48 PM 2/8/2002]
[Modified by Frank C, 1:48 PM 2/8/2002]
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Burning Brakes
Joined: Dec 2001
Posts: 901
Likes: 15
From: Punta Gorda, FL
Re: 91 L98 Injectors-Replacements? What Do I Do? (Frank C)
I bought a set of rebuilt Bosch injectors from these folks and they are terrific. $250. They also offered me FMS injectors with a lifetime warrantee. :D
http://www.lindertech.com
http://www.lindertech.com
Burning Brakes
Joined: Dec 2001
Posts: 901
Likes: 15
From: Punta Gorda, FL
Re: 91 L98 Injectors-Replacements? What Do I Do? (lspalding)
I bought a set of rebuilt Bosch injectors from these folks and they are terrific. $250. They also offered me FMS injectors with a lifetime warrantee. :D
http://www.lindertech.com
http://www.lindertech.com
Melting Slicks
Joined: Aug 2001
Posts: 2,753
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From: Fishkill NY
Re: 91 L98 Injectors-Replacements? What Do I Do? (lspalding)
Check the injectors out on ebay. I got a set of these for my 91 and I was told that these would work great. I will be installing these very soon, You can't beat the price of $160!!!
http://cgi.ebay.com/ebaymotors/aw-cg...item=600213412
http://cgi.ebay.com/ebaymotors/aw-cg...item=600213412
