Help with fuel injectors

gtstangrunner · May 29th, 2009, 01:55 PM

Hey everybody I am still having issues with my car not re-starting after it runs for like 5 minutes or more. It will usually start in flood mode though. What I noticed was when I took readings on my Fuel injectors I noticed 9 volts on injectors 7 and 8 with the key in the third position(Engine not running)

. All the other injectors had a reading of 0 volts which is what I expected. Correct me if I am wrong but the computer only sends 12 volts to the injectors at the proper time in which they should fire...... I'm guessing my computer is messed up and is keeping those two injectors open all the time and this is allowing those two cylinders to flood. Let me know what you all think.

WildWill · May 31st, 2009, 04:02 PM

Your assumption makes sense to me... I don't know what would cause the computer to be messing that up tho. Perhaps those two are just bad injectors. You could try replacing them?? I know that's an expensive thing to "try" but maybe it would be a good excuse for an upgrade

gtstangrunner · June 1st, 2009, 10:44 PM

Well when I tested for voltage I had the connector unplugged from the injector. I just wanted to see if the computer was sending voltage to any of the injectors at the wrong time. It seems that 7&8 are being told to fire all the time. The CCRM supplies 12 volts to the accessories and the computer grounds the injectors to complete the circuit. I'm going to test my CCRM tomorrow and if all the pins show the right voltage values and proper ground then I am going to assume the computer is whacked out. Any other suggestions keep em coming.

gtstangrunner · June 4th, 2009, 12:12 PM

CCRM pins all checked out ok. Pulled off my harness in the engine bay leading down to the EEC in the kick panel and probed the two pins for injectors 7 & 8 and they showed 1.6 volts. This tells me the problem is from that point to the computer itself. I checked to see if I had continuity with all the other pins and there was no continuity present, not even with ground. At this point I feel it's got to be the computer. Let me know what you all think.

gtstangrunner · June 5th, 2009, 04:55 PM

Ok, here goes I had 12 volts to all the injectors with the key in the third position. The side that gets grounded by the EEC had 1.6 volts on it for injectors 7 & 8. I probed with my DMM and found the problem to be on the computer side of the harness. Checked for continuity between the wires for 7 & 8 and all the other wires in the harness. The check came up negative which meant there were no shorts in my wiring. Swapped EEC's and the voltage(1.6 volts on grounded side) on those two wires went away and the car starts up each and everytime with no hesitation. The car also pulls alot harder all the way through to redline. As of right now the oil consumption has been reduced as well. Thanks for all you alls help ok.

1slo5.0 · June 5th, 2009, 07:50 PM

Diagnose and then repair FTW!

Glad to see you did that instead of replacing parts until you fixed the problem.

May 29th, 2009, 01:55 PM	#1
gtstangrunner Newbie Join Date: May 2009 Posts: 27 iTrader: 0 reviews	Help with fuel injectors Hey everybody I am still having issues with my car not re-starting after it runs for like 5 minutes or more. It will usually start in flood mode though. What I noticed was when I took readings on my Fuel injectors I noticed 9 volts on injectors 7 and 8 with the key in the third position(Engine not running). All the other injectors had a reading of 0 volts which is what I expected. Correct me if I am wrong but the computer only sends 12 volts to the injectors at the proper time in which they should fire...... I'm guessing my computer is messed up and is keeping those two injectors open all the time and this is allowing those two cylinders to flood. Let me know what you all think.

May 31st, 2009, 04:02 PM	#2
WildWill Hardcore Enthusiast 1995 Mustang GT Join Date: Oct 2007 Location: Solomons, MD Posts: 1,112 iTrader: 0 reviews	Your assumption makes sense to me... I don't know what would cause the computer to be messing that up tho. Perhaps those two are just bad injectors. You could try replacing them?? I know that's an expensive thing to "try" but maybe it would be a good excuse for an upgrade __________________ GT40p heads, 1.7 crane RR's, GT40 u/l, MAC LTs, MAC o/r h-pipe, Flowmaster 40s, 65mm t/b, '03 Cobra Bilstein Struts, Tokico Bullitt Shocks, MM c/c plates, Eibach Sportlines, B&M shifter, 255lph f/p, RAM p/g clutch, Fidanza alum fly, rebuilt t-5

June 4th, 2009, 12:12 PM	#4
gtstangrunner Newbie Join Date: May 2009 Posts: 27 iTrader: 0 reviews	Update CCRM pins all checked out ok. Pulled off my harness in the engine bay leading down to the EEC in the kick panel and probed the two pins for injectors 7 & 8 and they showed 1.6 volts. This tells me the problem is from that point to the computer itself. I checked to see if I had continuity with all the other pins and there was no continuity present, not even with ground. At this point I feel it's got to be the computer. Let me know what you all think.

June 5th, 2009, 07:50 PM	#6
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	Diagnose and then repair FTW! Glad to see you did that instead of replacing parts until you fixed the problem. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

Threads Similar to: Help with fuel injectors
Thread	Thread Starter	Forum	Replies	Last Post
SVT fuel pump, fuel injectors	Kennhyy3	V6 Mustangs	2	December 19th, 2008 05:08 AM
Fuel Injectors/fuel pressure	00silvergt	99-04	4	August 2nd, 2007 09:54 AM
Fuel Injectors	Euroeater95	94-95	5	June 21st, 2007 11:02 AM
Fuel injectors	ssdell3	99-04	36	June 20th, 2007 10:56 PM
Fuel Injectors	camer	V6 Mustangs	3	November 15th, 2006 06:05 PM

June 1st, 2009, 10:44 PM	#3
gtstangrunner Newbie Join Date: May 2009 Posts: 27 iTrader: 0 reviews	Well when I tested for voltage I had the connector unplugged from the injector. I just wanted to see if the computer was sending voltage to any of the injectors at the wrong time. It seems that 7&8 are being told to fire all the time. The CCRM supplies 12 volts to the accessories and the computer grounds the injectors to complete the circuit. I'm going to test my CCRM tomorrow and if all the pins show the right voltage values and proper ground then I am going to assume the computer is whacked out. Any other suggestions keep em coming.

June 5th, 2009, 04:55 PM	#5
gtstangrunner Newbie Join Date: May 2009 Posts: 27 iTrader: 0 reviews	Ok, here goes I had 12 volts to all the injectors with the key in the third position. The side that gets grounded by the EEC had 1.6 volts on it for injectors 7 & 8. I probed with my DMM and found the problem to be on the computer side of the harness. Checked for continuity between the wires for 7 & 8 and all the other wires in the harness. The check came up negative which meant there were no shorts in my wiring. Swapped EEC's and the voltage(1.6 volts on grounded side) on those two wires went away and the car starts up each and everytime with no hesitation. The car also pulls alot harder all the way through to redline. As of right now the oil consumption has been reduced as well. Thanks for all you alls help ok.

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

All times are GMT -4. The time now is 08:33 AM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.

Help with fuel injectors

Help with fuel injectors

Update