Having ECU Power Issue

Chambers · 11-09-2007, 03:02 AM

Hi all, I've been having occasional issues with starting my car. This morning I went to start my car and nothing, the engine wouldn't even turnover. Originally I thought it had something to do with the ECU main, in the fuse panel under the hood. But after swapping through 7 ECU mains the car still didn't stat, so I had to get a ride to my back up vehicle, not a big problem. I was thinking I would go to the dealership and get another main for temporary but then I thought it might be a ground, so I check the ground from the battery to the body and engine, and they were good, I don't know where any other grounds are so I haven't check them all.

When I got home about one hour ago I went out looked at the main, and the grounds again, then tried to start it, it turned over instantly but it took about four turnovers for it to start and it was running rough, so I popped the gas pedal and it started to idol fine. I then got hit with a big cloud of exhaust that smelled like unburnt fuel, it lasted for about one minute. So now I know the ECU is getting power because it pumped fuel into the cylinders and didn't burn it until I started it later. I'm not looking for the quick fix or the answer to all my problems, just suggestions and accounts if anyone else has had this happen to them. Where should I start to check the systems, and how should I go about the checks? Thanks.

btwilson86 · 11-09-2007, 03:19 AM

I used to have a 92 Jetta Gl, and one of my biggest problems was that when I turned the key, sometimes the starter wouldn't turn. Everything else happened correctly (i.e. radio turn off when holding to start, lights turn off, etc.) when I would turn it. My problem came from two angles. I had a bad chassis ground from the negative terminal on the battery, and the wires for the ignition were pulled so tight that they were starting to come out, causing a bad connection. I'm sorry if this isn't what your problem was, it's how I interpreted your post.

mrnickleye · 11-09-2007, 04:21 AM

http://www.cygnusx1.net/Supra/Librar....aspx?S=ST&P=1

Chambers · 11-09-2007, 03:53 PM

Thanks to both of you, I will check all three things, and replace what I must and go from there. Thanks again.

11-09-2007, 03:02 AM	#1
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	Having ECU Power Issue Hi all, I've been having occasional issues with starting my car. This morning I went to start my car and nothing, the engine wouldn't even turnover. Originally I thought it had something to do with the ECU main, in the fuse panel under the hood. But after swapping through 7 ECU mains the car still didn't stat, so I had to get a ride to my back up vehicle, not a big problem. I was thinking I would go to the dealership and get another main for temporary but then I thought it might be a ground, so I check the ground from the battery to the body and engine, and they were good, I don't know where any other grounds are so I haven't check them all. When I got home about one hour ago I went out looked at the main, and the grounds again, then tried to start it, it turned over instantly but it took about four turnovers for it to start and it was running rough, so I popped the gas pedal and it started to idol fine. I then got hit with a big cloud of exhaust that smelled like unburnt fuel, it lasted for about one minute. So now I know the ECU is getting power because it pumped fuel into the cylinders and didn't burn it until I started it later. I'm not looking for the quick fix or the answer to all my problems, just suggestions and accounts if anyone else has had this happen to them. Where should I start to check the systems, and how should I go about the checks? Thanks. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

11-09-2007, 03:19 AM	#2
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	I used to have a 92 Jetta Gl, and one of my biggest problems was that when I turned the key, sometimes the starter wouldn't turn. Everything else happened correctly (i.e. radio turn off when holding to start, lights turn off, etc.) when I would turn it. My problem came from two angles. I had a bad chassis ground from the negative terminal on the battery, and the wires for the ignition were pulled so tight that they were starting to come out, causing a bad connection. I'm sorry if this isn't what your problem was, it's how I interpreted your post. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

11-09-2007, 04:21 AM	#3
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	http://www.cygnusx1.net/Supra/Librar....aspx?S=ST&P=1 __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

11-09-2007, 03:53 PM	#4
Chambers walbro fp Join Date: May 2007 Location: USA - Harford County, Maryland Posts: 481	Thanks to both of you, I will check all three things, and replace what I must and go from there. Thanks again. __________________ Whats in the garage, well.... in the yard. 1986.5 Toyota Supra - NA - 5 spd 1986 Ford Ranger Lowrider - 5 spd 1984 Ford Ranger XLT - 7" Lift - 4X4 - Auto "Stuck in the 80's"

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