ordered new ecm
Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 2,770
Likes: 0
From: Construction Sucks! MI
Cruise-In V Veteran
St. Jude Contributor '03 & '05
ordered new ecm
well, my car still doesn't want to start all of the time and stalls at idle. i ordered a new ecm today and should get it in a couple of days. i figured $100 is a small fee, and it's probably due. if that doesn't work, anyone have any suggestions.
situation:
turn ignition to on, cooling fan turns on (A/C is off, no pins in ALDL), car won't start. the fan will turn off randomly and then the car will start, once i hear the fan kick back on, the car will stall. this is when the car is still cool.
i figure it has to be something electrical (new distributor, plugs, wires, etc. and I have fuel pressure at the rails). MAF and TB are clean.
situation:
turn ignition to on, cooling fan turns on (A/C is off, no pins in ALDL), car won't start. the fan will turn off randomly and then the car will start, once i hear the fan kick back on, the car will stall. this is when the car is still cool.
i figure it has to be something electrical (new distributor, plugs, wires, etc. and I have fuel pressure at the rails). MAF and TB are clean.
Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 2,770
Likes: 0
From: Construction Sucks! MI
Cruise-In V Veteran
St. Jude Contributor '03 & '05
Re: ordered new ecm (oldace84)
So why did you buy a new ECM?
tony
:flag
tony
:flag
Burning Brakes
Joined: Dec 1999
Posts: 1,114
Likes: 0
From: Lawrenceville Georgia
Re: ordered new ecm (neverendingproject)
I replaced my ecm/prom. Idle sucked, stalled at stoplights, cooling fan would not come on with a/c. After replacing the ecm/prom the high beam indicator light begin to work. I wonder if the highbeam indicator is a quick referrence for the shop to see if the ecm is working properly. I know it sounds dumb but you explain why mine only started working after replacing the ecm/prpm. ;)
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
Re: ordered new ecm (CountryBoy)
It's worth a shot. You'd be surprised what a funky ECM can make a car run like. I've been there. :yesnod:
[Modified by onedef92, 2:55 PM 9/19/2003]
[Modified by onedef92, 2:55 PM 9/19/2003]
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: ordered new ecm (onedef92)
Cooling fan on is any of...
1) ECM in limp home mode.
2) Stuck relay
3) Grounded fan wire
And probably a few more. I had an ECM fry once and the fan was on 100% and it was a total bitch to try and get the car running. Once it DID run you had to keep it at a certain RPM or it would die.
1) ECM in limp home mode.
2) Stuck relay
3) Grounded fan wire
And probably a few more. I had an ECM fry once and the fan was on 100% and it was a total bitch to try and get the car running. Once it DID run you had to keep it at a certain RPM or it would die.
Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 2,770
Likes: 0
From: Construction Sucks! MI
Cruise-In V Veteran
St. Jude Contributor '03 & '05
Re: ordered new ecm (scorp508)
And probably a few more. I had an ECM fry once and the fan was on 100% and it was a total bitch to try and get the car running. Once it DID run you had to keep it at a certain RPM or it would die.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 2,770
Likes: 0
From: Construction Sucks! MI
Cruise-In V Veteran
St. Jude Contributor '03 & '05
Re: ordered new ecm (86_RedRider)
The new ecm was the solution. popped the new one in and it started right up. took it around for a cruise and had no problems.
Thread Starter
Melting Slicks
Joined: Feb 2003
Posts: 2,770
Likes: 0
From: Construction Sucks! MI
Cruise-In V Veteran
St. Jude Contributor '03 & '05
Re: ordered new ecm (vinnies87)
just 32, but i've been getting the egr code for about 2 years. the no codes kind of led me to think that it was the ecm. how does a part that is bad, report itself? :lol:
also, when it was acting up, i couldn't pull any codes. i'd put the wire into the pins on the aldl and turn the ignition to on. but the cooling fan was coming on anyways and the ses wouldn't even blink the code 12.
also, when it was acting up, i couldn't pull any codes. i'd put the wire into the pins on the aldl and turn the ignition to on. but the cooling fan was coming on anyways and the ses wouldn't even blink the code 12.
Le Mans Master
Joined: Aug 2003
Posts: 9,884
Likes: 3
From: Magnolia Mississippi
St. Jude '03-'04-'05-'06-'07
Re: ordered new ecm (86_RedRider)
:rolleyes: well wondering if you had any others associated with your decision.. but very good point, definately hard to report on yourself..ecm... but glad to hear your running...
Safety Car
Joined: Feb 2001
Posts: 4,397
Likes: 0
From: Looks like I picked the wrong week to stop sniffin glue Orlando
Re: ordered new ecm (86_RedRider)
My 90 did something similar. The car would run so rich that it wouldn’t idle, checked the TPS Sensor, and it was within specs. This problem drove me nutz for 3 months.
Finally gave in and bought the ECM to PC cable, and used the Craig Moats software to monitor the ECM. I would have never found the root of the problem without it.
Even though the TPS was working correctly, the ECM was misinterpreting the signal.
Instead of showing an idle voltage the ECM was reading full throttle voltage from the TPS at idle and subsequently poring fuel into the cylinders.
When I changed the engine oil, it was grey in color.
I replaced the ECM with a Napa unit, and worked great for 2 weeks. Replaced it under the 12 month warranty, and it’s been fine ever since.
:cheers:
Finally gave in and bought the ECM to PC cable, and used the Craig Moats software to monitor the ECM. I would have never found the root of the problem without it.
Even though the TPS was working correctly, the ECM was misinterpreting the signal.
Instead of showing an idle voltage the ECM was reading full throttle voltage from the TPS at idle and subsequently poring fuel into the cylinders.
When I changed the engine oil, it was grey in color.
I replaced the ECM with a Napa unit, and worked great for 2 weeks. Replaced it under the 12 month warranty, and it’s been fine ever since.
:cheers: