´91 injectors
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Pro
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´91 injectors
Three of my injectors show low ohm reading. Two are at 6.5 and one at 13.9 ohm when in the car. The other ones read about 17 ohm. Haven´t checked pressure yet. What is stock on a ´91. Don´t know the type but from up to down they look grey connector, grey plastic tube like and then silver ring before they go into engine. 45k mls, aut. Live in Sweden, therefore kind of weird explanation of things. Considering you guys on the other side of this green ball are more familiar with those cars. What is easiest way to check pressure (22, 24lbs)? My auto shifts up a bit rough from second to third. Any ideas what this can be. Thanks for any input.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Replace the injectors. You have the unservicable (Multec) injectors 22lb. Use a fuel pressure guage attached to the schrader valve to check fuel pressure. From the ohming them you confirmed the coil resistance is shot one a few of them.
Intermediate
Joined: Aug 2006
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Summit Racing summitracing.com has 24 lbs injectors that will fit your car. They are Ford Motor Racing and sell for about $389.00 US. I think you should have a transmission specialist diagnose the problem. Do you have an Autobahn in Sweden with no speed limits? I've been to Europe a few times and love driving with no speed limits. 
Intermediate
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WOW I just checked that summitracing.com websiste and I found these: Guys will these fit a C4. I have an 88 and would like a set of them. $291.00 is cheap for good injectors. What do you think?
Ford Racing High Flow Fuel Injectors Fuel injectors made for performance.
Ford Motorsports offers these sets of high-flow rate fuel injectors that are specifically designed for performance applications. The injectors work best with air meters with revised calibrations, and have been specially trimmed for high flow rates.
Select Part Part# Description Ship by Price + to Cart/Wishlist
+ Compare Sort By: Part Number (a-z) Part Number (z-a) Default Sort Price (low-high) Price (high-low) Product Line (a-z) Product Line (z-a) Should Ship By
FMS-M-9593-A302 Fuel Injectors, EV1, 24 lbs./ hr., 11-18 Ohms Impedance, 12 V Saturated Circuit Driver, Ford, Set of 8
Monday $291.95
Ford Racing High Flow Fuel Injectors Fuel injectors made for performance.
Ford Motorsports offers these sets of high-flow rate fuel injectors that are specifically designed for performance applications. The injectors work best with air meters with revised calibrations, and have been specially trimmed for high flow rates.
Select Part Part# Description Ship by Price + to Cart/Wishlist
+ Compare Sort By: Part Number (a-z) Part Number (z-a) Default Sort Price (low-high) Price (high-low) Product Line (a-z) Product Line (z-a) Should Ship By
FMS-M-9593-A302 Fuel Injectors, EV1, 24 lbs./ hr., 11-18 Ohms Impedance, 12 V Saturated Circuit Driver, Ford, Set of 8
Monday $291.95
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Originally Posted by CMYC4GO
If you change to a PSI rating other than OEM, don't you have to have a chip burned to compensate for the change? I really don't think it's as easy as just "plug and play".
Last edited by RRT vette; Sep 24, 2006 at 10:13 PM.
Drifting
Joined: Apr 2005
Posts: 1,283
Likes: 12
From: New York
These should all ohm out at 16.5, +/- .3, according to Chevrolet technical bulletins on injector service, so as mentioned above, replacement is due. By your description of what you have, it sounds like you have the original Rochester Products (denoted by the RP on the side of the injector) Multitech unit. What you use is a whole different subject.
I put Bosch 22.5 lb. injectors in my 1991 that is all stock except for a Magnaflow exhaust with good results. The car definitely idles smoother, and starts up like new, but it is all a matter of preference.
I put Bosch 22.5 lb. injectors in my 1991 that is all stock except for a Magnaflow exhaust with good results. The car definitely idles smoother, and starts up like new, but it is all a matter of preference.
Last edited by LS6 Motor; Sep 24, 2006 at 10:35 PM.
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Originally Posted by CALI C4er
Summit Racing summitracing.com has 24 lbs injectors that will fit your car. They are Ford Motor Racing and sell for about $389.00 US. I think you should have a transmission specialist diagnose the problem. Do you have an Autobahn in Sweden with no speed limits? I've been to Europe a few times and love driving with no speed limits.
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Originally Posted by jimmya
should be around 39 psi idling, 45 or so at wide open throttle. not an expert, just a little friendly advice.
