![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
|
![]() |
#1 |
Registered User
Join Date: Mar 2008
Location: New York
Posts: 18
|
My (dumb) electical saga
1987 TBI 305.
I was doing some roofing one day and I saw a coolant puddle under the front of the truck. traced it to the radiator... I replaced the radiator with a used one. The one I got had lost its' overflow nipple. I was able to rescue the nipple from the old rad. and attach it using some JB weld. During old rad removal, one transmission line had rusted to the old rad. So I learned how to do a double flare with transmission oil flowing out if the pipe! Satisfied with my repair, I went to hook up the battery. The Previous owner used a wired with a red stripe on the neg. side and I innadvertantly hooked up the battery backwards. Lot's of sparks and a smoking alternator.... ![]() I replaced the alternator, found a burnt fuse (ecmb). An there was no start. It would turn over but not catch. But it would catch with starting fluid. I figured the problem was a reoocuring one I had with the fuel switching valve. It sometimes would get stuck on the tank that I don't use. I ripped out the old valve and wired the working pump directly to the electrics and the lines directly to the engine...also changed the old fuel filter (eewww!). Still same no start condition. Started changind ignition related items. Ignition control module (under disributor cap, all fusable links and still no joy... Investigated TB and had to reinstall new gaskets for the fuel injectors... More later! |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: Sep 2008
Location: Bailey, NC
Posts: 2,462
|
Re: My (dumb) electical saga
You may have fried the ECM for the engine. Usually modules are the first to go when hooking a battery up backwards.
__________________
Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT |
![]() |
![]() |
![]() |
#3 | |
Registered User
Join Date: Mar 2008
Location: New York
Posts: 18
|
Re: My (dumb) electical saga
Sorry It was time to commute to work....
Quote:
I'll get to that... The problem was that there was fuel in the TB but the injectors were'nt firing. I finally got a computer from a junkyard and had some success. ![]() Problem was an EXTREMELY high idle. It sounded like someone had floored the accelerator. I did some research and found that this could be caused by a leaky TB gasket. Since I had also changed the Ignition control module, I figured that could be the problem. While the TB was out it was much easier to work near the distributor cap! After the gaskets were in place, TB rebuilt, and the old Ignition control module was installed Everything worked! I wish I had gone after the ECM first. But it gave me the chance to get intimate with the fuel and ignition systems of my truck. the interesting thing is this. I would hav figured that the two chips on the computer would have been fied as well... But I am currently running with the old chips in the new computer...go figure! So that's the end of the story. I figured I'd just add it to the knowledge base in case anybody else crosses their terminals like me! |
|
![]() |
![]() |
![]() |
#4 |
Robert Olson Transport
![]() Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,287
|
Re: My (dumb) electical saga
thanks for the info!
__________________
Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
![]() |
![]() |
![]() |
Bookmarks |
|
|