84 Crossfire Injector behavior and Idle issues
Thread Starter
8th Gear
Joined: Aug 2017
Posts: 8
Likes: 0
84 Crossfire Injector behavior and Idle issues
Sorry for the intrusion, I have my post in the c4 section where it belongs, but I'm in desperate need of help.
So I recently acquired a 1984 Crossfire, and I've been noticing a few bugs I'm having trouble tracking down & finding answers for.
Upon first start up the car idles normal, but after about 15-20 seconds I notice it's a bit hesitant with it's idle. Then, as soon as I try to give it a little gas, it stalls out (~5% throttle) however anything above that is fine. I took off the air cleaner cover to look at the spray pattern and I noticed that when it's given little throttle, the injectors spray as much as they do if I gave it 80% throttle. I could really use some help with this if anyone has a solution.. thanks!
So I recently acquired a 1984 Crossfire, and I've been noticing a few bugs I'm having trouble tracking down & finding answers for.
Upon first start up the car idles normal, but after about 15-20 seconds I notice it's a bit hesitant with it's idle. Then, as soon as I try to give it a little gas, it stalls out (~5% throttle) however anything above that is fine. I took off the air cleaner cover to look at the spray pattern and I noticed that when it's given little throttle, the injectors spray as much as they do if I gave it 80% throttle. I could really use some help with this if anyone has a solution.. thanks!
Burning Brakes
Joined: Sep 2013
Posts: 1,206
Likes: 365
From: The Motor City
Have you replaced the throttle position sensor, by chance. And, have you pulled any codes by following the code-extraction procedure in the shop manual? It is important to verify that you are getting a 1-2, 1-2 in the ECM system test. I wouldn't rule out a vacuum leak either, whereby the higher RPM re-seats the leaking hose at its hose connection.
Dave
Dave
Thread Starter
8th Gear
Joined: Aug 2017
Posts: 8
Likes: 0
Thanks everyone. I will be looking into my TPS and possibly replacing it. Upon further inspection it looks like the wires have been tapped and it has a testing 'connector' added on. I also noticed yesterday that my brake light switch failed (my brake lights stayed on without me touching it), so I do believe that's contributing to my idle issue as well. I will update when I make some progress, but keep the suggestions coming!
thanks, -B
thanks, -B
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Is the ECM operational? You should see the "Check Engine" symbol light up on the dash when you just turn the ignition key to "on" position. That light should then go "off" when you start the car.
If those conditions are met, your computer should be working fine and have no 'trouble codes' captured.
If those conditions are NOT met, you need to get the ECM operational (or 'check engine' light fixed/replaced) so you can download trouble codes. Those will guide you to the source of your problems.
If those conditions are met, your computer should be working fine and have no 'trouble codes' captured.
If those conditions are NOT met, you need to get the ECM operational (or 'check engine' light fixed/replaced) so you can download trouble codes. Those will guide you to the source of your problems.
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Verdad Gallardo
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
Thanks everyone. I will be looking into my TPS and possibly replacing it. Upon further inspection it looks like the wires have been tapped and it has a testing 'connector' added on. I also noticed yesterday that my brake light switch failed (my brake lights stayed on without me touching it), so I do believe that's contributing to my idle issue as well. I will update when I make some progress, but keep the suggestions coming!
thanks, -B
thanks, -B