Wont stay running
#1
Wont stay running
I have an 89 RS 305 TBI auto trans. My car has always had a problem where about once a month it would shut off at a stop but it wasnt really a big deal because it would start back up just fine. A couple weeks ago my Ignition control module went out and I replaced it and the distributor cap and rotor. Since then the car wants to shut off every time I shift into reverse or drive unless I give it gas. Its the same problem ive had before just much worse. Just yesterday I replaced the spark plugs, plug wires, coolant temp sensor and the fuel filter and it keeps doing the same thing. Any troubleshooting or common problems would help greatly because this is my daily driver and ive got to go 250 miles on sunday.
#3
Re: Wont stay running
I have no way of checking the fuel pressure but could it be something else?
also if it help it shifts just fine between reverse and drive but not from neutral or park to drive or reverse
also if it help it shifts just fine between reverse and drive but not from neutral or park to drive or reverse
Last edited by jbuck_atlanta; 06-28-2019 at 07:33 PM.
#6
Re: Wont stay running
#7
Senior Member
iTrader: (2)
Re: Wont stay running
I have an 89 RS 305 TBI auto trans. My car has always had a problem where about once a month it would shut off at a stop but it wasnt really a big deal because it would start back up just fine. A couple weeks ago my Ignition control module went out and I replaced it and the distributor cap and rotor. Since then the car wants to shut off every time I shift into reverse or drive unless I give it gas. Its the same problem ive had before just much worse. Just yesterday I replaced the spark plugs, plug wires, coolant temp sensor and the fuel filter and it keeps doing the same thing. Any troubleshooting or common problems would help greatly because this is my daily driver and ive got to go 250 miles on sunday.
Bold Point 2 - This reminds me of a situation I had that ended up being Fuel Pressure related. Drive/Reverse are higher fuel demand conditions over Park/Neutral.
Bold Point 3 & the above quote - I wouldn't guess, if you have a 250 mi trip to make sunday then you need a systematic approach to troubleshooting. FIRST thing tomorrow morning RENT the FP Test gauge as suggested. Tap either under the hood or at the filter. By almost any means necessary safely measure the fuel pressure while driving about 10ft-15ft maybe 20ft forward or reverse. If pressure drops below 11psi hope for a clogged fuel filter because your heading to pumpsville unless you've got a line leak.
Fuel Pressure can impact O2 voltage & MAP voltage ALL of which will leave you stranded BUT more importantly all of this is ONLY my
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#8
Re: Wont stay running
Bold Point 1 - Have you pulled trouble codes? Checked and replaced any/all damaged grounds? (as you mentioned in another thread of yours I believe)
Bold Point 2 - This reminds me of a situation I had that ended up being Fuel Pressure related. Drive/Reverse are higher fuel demand conditions over Park/Neutral.
Bold Point 3 & the above quote - I wouldn't guess, if you have a 250 mi trip to make sunday then you need a systematic approach to troubleshooting. FIRST thing tomorrow morning RENT the FP Test gauge as suggested. Tap either under the hood or at the filter. By almost any means necessary safely measure the fuel pressure while driving about 10ft-15ft maybe 20ft forward or reverse. If pressure drops below 11psi hope for a clogged fuel filter because your heading to pumpsville unless you've got a line leak.
Fuel Pressure can impact O2 voltage & MAP voltage ALL of which will leave you stranded BUT more importantly all of this is ONLY my
Bold Point 2 - This reminds me of a situation I had that ended up being Fuel Pressure related. Drive/Reverse are higher fuel demand conditions over Park/Neutral.
Bold Point 3 & the above quote - I wouldn't guess, if you have a 250 mi trip to make sunday then you need a systematic approach to troubleshooting. FIRST thing tomorrow morning RENT the FP Test gauge as suggested. Tap either under the hood or at the filter. By almost any means necessary safely measure the fuel pressure while driving about 10ft-15ft maybe 20ft forward or reverse. If pressure drops below 11psi hope for a clogged fuel filter because your heading to pumpsville unless you've got a line leak.
Fuel Pressure can impact O2 voltage & MAP voltage ALL of which will leave you stranded BUT more importantly all of this is ONLY my
I thought it would have something to do with the vacuum or carb but I guess not. I dont really know how to test the fuel pressure for a tbi, does anyone know a forum for it or instructions?
#9
Re: Wont stay running
My fuel pressure is fine. Out of desperation I unplugged the IAC valve and ran it and it sat a 2k rpms so I know thats not the problem. Then I took out the tps sensor and when I shift everything is really smooth and doesn't shut off but instead sits at 1000 rpms. Could that be a problem? Also what would the voltage need to be for the tps for a 305 tbi
#11
Re: Wont stay running
Ive bought a new TPS. If that doesn't turn out to be the problem would it hurt anything if i were to drive it without the tps in? It seems to run better without it.
#12
Re: Wont stay running
Now that I think about it, could I have installed my Ignition control module on wrong or not tight enough to get a proper ground? I heard some say that there should be some sort of lubricant below it where it touches the base of the distributor cap. Is this true? And is that the ground location for it?
#13
Senior Member
iTrader: (2)
Re: Wont stay running
Now that I think about it, could I have installed my Ignition control module on wrong or not tight enough to get a proper ground? I heard some say that there should be some sort of lubricant below it where it touches the base of the distributor cap. Is this true? And is that the ground location for it?
#14
Re: Wont stay running
Alright, so far ive replaced
-ICM
-Distributor Cap & Rotor
-Spark Plugs
-Plug Wires
-Coolant temp sensor
-TPS
-EGR Valve
-Fuel Filter
My car still shuts off when I'm at a stop or when I shift into drive or reverse. Im guessing my next step (probably should have done before) is to check the fuel pressure with some sort of fitting I can put between the soft and hard part of my fuel line to see if my pump is going bad?
-ICM
-Distributor Cap & Rotor
-Spark Plugs
-Plug Wires
-Coolant temp sensor
-TPS
-EGR Valve
-Fuel Filter
My car still shuts off when I'm at a stop or when I shift into drive or reverse. Im guessing my next step (probably should have done before) is to check the fuel pressure with some sort of fitting I can put between the soft and hard part of my fuel line to see if my pump is going bad?
Last edited by jbuck_atlanta; 07-02-2019 at 12:27 PM.
#15
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Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
Re: Wont stay running
Maybe check the idle air motor/passage for carbon/soot buildup ?
#16
Re: Wont stay running
Thank you everyone for the help. I finally figured my **** out. The new Ignition Control Module was faulty. It would turn over the car but at low rpms it would die. Wish i figured it out earlier before I did literally everything else on that list to my car. But at-least I got a lot of preventative maintenance done and learned a lot in the process.
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