95 GT having some issues

3.8 and 5.0 liter
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DirtyDirtyRacing
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95 GT having some issues

Post by DirtyDirtyRacing » Tue Aug 14, 2007 11:23 pm

car has 60lbs injectors , guy says they are high impedance but after working on the car tonight I am not so sure what to think , my question is if the injectors are low impedance will the car run so rich that it wont run ? I hooked up a stock MAF to the car today and went in the tune and changed the injector hi/low slopes and breakpoint and min PW and tried to start the car unhooked the blower and just tried to start the car on motor alone and the car is still running so rich that it wont run .....I am starting to wonder if the injectors are actually low or high impedance ? anybody ever ran into this ??? how can I tell other than trying to get this guy to find the part number on them from when he ordered them ...
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2276 Magnolia Dr.
Bedford VA 24523
ph# 540-875-8722
Dynocom 1800X Loaded Chassis Dyno

sniperpat469
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Re: 95 GT having some issues

Post by sniperpat469 » Wed Aug 15, 2007 9:50 am

Which Maf meter is he running. and how is it installed. The injector impedence shouldent have too much effect on Idle.

Patrick
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DirtyDirtyRacing
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Re: 95 GT having some issues

Post by DirtyDirtyRacing » Wed Aug 15, 2007 12:29 pm

sniperpat469 wrote:Which Maf meter is he running. and how is it installed. The injector impedence shouldent have too much effect on Idle.

Patrick

it had a blow thru on it calibrated for the 60lbs injectors , I ordered a Sniper MAF meter thinking it was probably bad , but last night I got my hands on a stock MAF , disconnected the blower piping and tried to get the car to start up on its own on motor , put the stock MAF curve in the tune and set the injector slopes etc....and the car just blows black smoke out and wont run , changed coils same thing , I am going to check some other things out today like the O2 sensor wires under the car and might disconnect the MSD 6A box and just hook the coil direct to the factory ignition and take the ignition module and have it checked to make sure its ok .....its either getting way too much fuel or not enough spark to burn it .....
http://www.Dirtydirtyracing.com
2276 Magnolia Dr.
Bedford VA 24523
ph# 540-875-8722
Dynocom 1800X Loaded Chassis Dyno

sniperpat469
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Re: 95 GT having some issues

Post by sniperpat469 » Wed Aug 15, 2007 12:50 pm

who makes the injectors, how long have they been installed on the car , a problem with low impedence injectors is over time they will kill the injector drivers in the ECU causing a problem like you describe, I think though you will find there is a problem not related to the tuning.

Patrick
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Re: 95 GT having some issues

Post by DirtyDirtyRacing » Wed Aug 15, 2007 1:22 pm

sniperpat469 wrote:who makes the injectors, how long have they been installed on the car , a problem with low impedence injectors is over time they will kill the injector drivers in the ECU causing a problem like you describe, I think though you will find there is a problem not related to the tuning.

Patrick

the guy said the car ran ok for about 2 weeks ? so if I am reading what you say correctly , they are probably low impedance injectors and they have messed up the injector drivers in the ECU ? I am trying to get a hold of the guy to get me a part number and brand of the injectors he put on it .....
http://www.Dirtydirtyracing.com
2276 Magnolia Dr.
Bedford VA 24523
ph# 540-875-8722
Dynocom 1800X Loaded Chassis Dyno

sniperpat469
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Re: 95 GT having some issues

Post by sniperpat469 » Wed Aug 15, 2007 2:16 pm

I cant say for sure the drivers could be bad but it has happened to me on chevys and fords alike.

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Mattr66
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Re: 95 GT having some issues

Post by Mattr66 » Wed Aug 15, 2007 2:55 pm

yep it could definitely burn out the injector drivers if they are low impedence. If they are and you replace the pcm, I have had good luck with the low impedence driver from http://www.acceleronics.com/versafueler.htm
I ran some 96 pound injectors on a vette and this box works great! Those big injectors aren't sloppy at all since they have so much current to drive them.
Matt R
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DirtyDirtyRacing
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Re: 95 GT having some issues

Post by DirtyDirtyRacing » Wed Aug 15, 2007 5:55 pm

Well I am probably going to pull the injectors out tonight or tomorrow and see if I can get a part number off of them , but from looking at them and pics on they look to be high impedance injectors , if the are high impedance what are the chances the ECM is still bad ? They look exactly like these
http://www.fiveomotorsport.com/PartsJPE ... lbHIGH.jpg
http://www.Dirtydirtyracing.com
2276 Magnolia Dr.
Bedford VA 24523
ph# 540-875-8722
Dynocom 1800X Loaded Chassis Dyno

Mattr66
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Re: 95 GT having some issues

Post by Mattr66 » Wed Aug 15, 2007 6:38 pm

Just measure resistance across the electrical connections on the injectors. (Just unplug the harness from one of them and measure with an ohmmeter.)

High impedance injectors are usually 12 to 16 ohms while low impedance injectors usually are 2 to 5 ohms.

Hope this helps,
Matt R
Matt Robinson
Delta Force Gas and Diesel Tuner
www.gearheadautomotiveperformance.com

DirtyDirtyRacing
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Re: 95 GT having some issues

Post by DirtyDirtyRacing » Wed Aug 15, 2007 11:16 pm

Mattr66 wrote:Just measure resistance across the electrical connections on the injectors. (Just unplug the harness from one of them and measure with an ohmmeter.)

High impedance injectors are usually 12 to 16 ohms while low impedance injectors usually are 2 to 5 ohms.

Hope this helps,
Matt R
yea the 60lbs are supposed to be 12.5 I will check it tomorrow to make 100 percent sure whats going on ....I hate not knowing what I am dealing with
http://www.Dirtydirtyracing.com
2276 Magnolia Dr.
Bedford VA 24523
ph# 540-875-8722
Dynocom 1800X Loaded Chassis Dyno

DirtyDirtyRacing
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Re: 95 GT having some issues

Post by DirtyDirtyRacing » Mon Oct 08, 2007 1:39 am

update , finally got a set of stock 19 lbs injectors and stock MAF for a 95 GT that I borrowed to try ......unhooked the tube coming from the blower , car started up and ran like a champ with no chip ........hopefully going to change out the injectors next week and maybe hit the dyno up and see what kind of numbers this car will make ....
http://www.Dirtydirtyracing.com
2276 Magnolia Dr.
Bedford VA 24523
ph# 540-875-8722
Dynocom 1800X Loaded Chassis Dyno

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