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Old 04-09-2019, 07:26 AM   #1 (permalink)
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Default New owner 95 3si no injector pulse

Hello all I could use a hand as ive searched all over and tried many things with no luck. Currently my 3si would not start from the moment I purchased it but figured incould figure it out. Car cranks all day fine fuel pump is engaging and pumping fuel but car will only temporarily fire if I spray starter fluid in the throttle body. Ive replaced the ecm crank sensor cam sensor checked all the fuses and even found a couple broken wires I repaired. Hooked up noid lights to the injectors and have no pulse all the injectors are receiving 12v on one wire and like .5 volts on the 2nd wire. For some reason I can't figure out the injectors are not receiving a signal to ground the injectors and make them pulse. Timing was also checked and is fine. Please if anyone has had a similar issue of really love any info. Thanks
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Old 04-09-2019, 07:42 AM   #2 (permalink)
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Also forgot to mention its.non turbo and had a hacked up aftermarket security system that i removed and put all the wires back to normal
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Old 04-09-2019, 08:29 AM   #3 (permalink)
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The injector ground signals are directly wired into the ecu, unplug the ecu connectors and check the ecu connector pins with the other end of the multimeter at the injector pins. They should have a connection ( almost no resistance). If you don't have that, the loom is hacked up somewhere. Since you got power to the injectors, it's not a fuse or MFI relay issue.

The ecu gives the signal to fire the injectors already when in cranking mode (starter signal to ecu).
Even without a cam/cas signal during that time.

If the wire loom does check out it's an issue with the ecu (ecm) probably.

You can unhook TPS, maf and cam /cas and ptu, fuelpump, but the injectors should get a pulse to work in crank mode independently.

If the ecu does not see a good cam /cas signal it will shut down. Once you let go of the starter.

If no fuel enters but you got spark your fluid you just sprayed will ignite once or so, that explains the short 'running'.

Last edited by enkaio; 04-09-2019 at 08:35 AM.
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Old 04-09-2019, 08:39 AM   #4 (permalink)
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Thanks I will give that a shot I almost bet its a wiring issue like most older cars now someone decided to hack it all up for some unknown reason ill get back to you soon thank again
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Old 04-09-2019, 09:00 PM   #5 (permalink)
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Default Re: New owner 95 3si no injector pulse

Thats good info, I have the same issue in my 93, add to the fact the engine is an OBD2...
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Old 04-09-2019, 09:02 PM   #6 (permalink)
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I have an obd2 port but my scanner keeps getting an error when using it but works fine on all other cars
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Old 04-12-2019, 05:54 AM   #7 (permalink)
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Default Re: New owner 95 3si no injector pulse

Quote:
Originally Posted by Mathenyswole View Post
I have an obd2 port but my scanner keeps getting an error when using it but works fine on all other cars
That is because a 95 is not true OBD2, its a hybrid of OBDI (software, sorta) and OBD2 hardware. (Trust me, I know, I have a 95!)

BLACKSTEALTH (makes all sorts of great electronic "gadgets" for our cars) I'm sure can elaborate....

Bob.
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