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Registered User
Join Date: Mar 2003
Location: GA
Posts: 145
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87 944 Injectors Won't Fire!


The car has new coil, 2 DMEs I can try, new plugs, recently cleaned injectors, new wires, new dist cap and rotor, new fuel pump, fuel filter, fuel lines, etc., etc., and shows proper cranking and spark (slightly weak).

The rail has pressure and the pump runs, but the injectors won't fire.

Any ideas? Is this a harness issue? Must be, right? Thanks in advance.

Neil Deshpande
1987 944 NA 5-sp
Old 05-10-2007, 12:53 PM
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That Guy
Techno Duck's Avatar
Join Date: Mar 2003
Location: San Diego, CA
Posts: 4,844
Are the speed and reference sensors gapped correctly?

With the ignition on (but car not running) check for voltage across the injector connector pins. This will atleast rule out a break in the injector wire harness.

Ive also heard of injectors seizing up on the inside when left unused. Might want to take one off and lay it on a bench. Run 12v intermittently across the pins and you should hear a audible click.

From the WitchHunter website..

"Don't let injectors dry out when that are out of the car. Store them in a plastic bag and keep them indoors. Be aware they they may stick closed after a time.

A 9 volt battery can be used to check for stuck injectors, listen for a click. Don't use the car's battery for testing, it can overheat the injector coil, (especially low impedance injectors). Just because an injector "clicks", it doesn't mean that it flows correctly, it just indicates it's not stuck.

If injectors are stuck after sitting for a short time, sometimes a "tap" with a small hammer on the metal body can free it. Don't break anything... I said "tap". If that doesn't work, send them to us. "
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1

Last edited by Techno Duck; 05-10-2007 at 01:26 PM..
Old 05-10-2007, 01:19 PM
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Registered User
Join Date: May 2005
Location: Tucson
Posts: 203
All four of my injectors were siezed after about a year of sitting, and 12vs directly to them did the trick.
-and I did use the car batt. but with no problems (that I know of).
It would be interesting to test their spray patterns and flow rates, since I've heard even new OEM injectors can have a 10% discrepancy in flow between two injectors.
-black 1988 924s, 944 turbo sway bars, LSD, gunmetal phone dials-- SOLD to some people who cannibalized her
-1987 MR2

Last edited by blk924s; 05-11-2007 at 12:12 PM..
Old 05-11-2007, 12:06 PM
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