Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Workhorse and Chevrolet Chassis Motorhome Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 06-05-2021, 03:08 PM   #1
Junior Member
 
Join Date: Jun 2021
Posts: 7
Help...ECM 454 older model

Hi. I know nothing about the combustion engine. Bought a 1993 Pace Arrow 34 foot with a Chevy 454. Chasis batteries and 12v all died over the year. I am new to rv thing, as a pro musician it seemed safe...
Anyway, some fine folks in the park said they knew how to change the batteries. Needless to say, after buying 3 batteries, they caught a 6v and 12v on fire.
Got the power right, a classic car mechanic buddy is doing it, he is a full time mech. It seems now its not getting spark or fuel. We replaced fuses, and got electrical sorted out, it will try to crank but never actually engage. Its a 93, so if the ECM is smoked, I should be able to find a refurbished or something. I read another thread discussing ECMs and I see a few folks who think it might not be...but we replaced fuses, coil on the alternator, burnt cables, batteries...and Im broke lol. Also, the generator, which is gas off the engine, will not engage either.
Thank you for any advice. God bless, drive safe.
brianKGuitar is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-05-2021, 11:40 PM   #2
Senior Member
 
Join Date: Aug 2016
Location: Seattle,WA/HB,CA./Fujieda-Japan
Posts: 809
1. Check all your fuses Under dash near steering column)

2. If they check good and still not start...check to see that the TBI injectors are spraying when cranking.

3. If you see fuel it is likely the ICM (Ignition control module) or ignition coil itself (mounted next to distributor).

If I were you I'd pull the distributor and replace the pick up coil and clean the distributor well. Check that the stator ring is not cracked or loose. Use AC Delco parts. Be sure and mark the distributor prior to removal (take a pic straight down view cap off rotor still installed). Install new ICM with thermal paste, new rotor and cap. You may as well do plugs and wires as well.
__________________
1994 Southwind Storm 28ft 7.4L TBI w/ 4L80E P-32
71,405 miles and counting...as of 07/16/2021
VIN#1GBJP37N4R3314754
udidwht is offline   Reply With Quote
Old 06-06-2021, 08:25 AM   #3
Senior Member
 
Join Date: May 2004
Location: MI
Posts: 779
A scan tool will tell you if the ECM is good. An error similar to 'no communication' would pretty much mean you need a new one.

Most remanufactured boards won't have the PROM for your engine, that contains data for the specific engine and use.

It will have to be removed from the old board and installed on the reman board. I wouldn't bet that the PROM made it through if the board didn't. I'd look for a used ECM out of a motorhome chassis that had the PROM.

In that era Chevy used a oil pressure sender that would shut down the engine if it lost pressure. To start it there is a stand alone timer that allowed the engine to start and run for 15 seconds or so with no input from the oil pressure sender, then the timer dropped out and the ECM controlled the engine. The timer was located on the back of the engine.

I'd hook up a scanner and see if it could even find the ECM. Make sure all plugs are tight and not burned. If it's electrically there and every looks good on the plugs I lean towards the timer got cooked. Maybe short around it, I don't know of any real check. It didn't fail hardly ever so it just got replaced if everything was right and the engine wouldn't start.

Does everything still work in the house?
Argosy is online now   Reply With Quote
Old 06-06-2021, 10:46 PM   #4
Junior Member
 
Join Date: Jun 2021
Posts: 7
Quote:
Originally Posted by Argosy View Post
A scan tool will tell you if the ECM is good. An error similar to 'no communication' would pretty much mean you need a new one.

Most remanufactured boards won't have the PROM for your engine, that contains data for the specific engine and use.

It will have to be removed from the old board and installed on the reman board. I wouldn't bet that the PROM made it through if the board didn't. I'd look for a used ECM out of a motorhome chassis that had the PROM.

In that era Chevy used a oil pressure sender that would shut down the engine if it lost pressure. To start it there is a stand alone timer that allowed the engine to start and run for 15 seconds or so with no input from the oil pressure sender, then the timer dropped out and the ECM controlled the engine. The timer was located on the back of the engine.

I'd hook up a scanner and see if it could even find the ECM. Make sure all plugs are tight and not burned. If it's electrically there and every looks good on the plugs I lean towards the timer got cooked. Maybe short around it, I don't know of any real check. It didn't fail hardly ever so it just got replaced if everything was right and the engine wouldn't start.

Does everything still work in the house?
Thank you. Yes in the house everything is fine. The generator won't turn over either...
brianKGuitar is offline   Reply With Quote
Old 06-07-2021, 06:16 AM   #5
Senior Member
 
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 4,258
The very first thing I would check would be the heavy wire plugged into the distributor cap to be sure you are getting 12V. to the distributor when the ignition switch is in the on position. On most passenger vehicles and light trucks this is a red wire with a white connector.
If your friend suspects a faulty ECM (computer) you might want to check with these people for testing before you just run out and buy one:
www.AUTOECMS.com (877) 687 3267 * (570) 883 9930
The pick up coil inside the distributor can be tested with an ohm meter. Some auto parts stores have ignition control module testers. The module would have to be removed to be tested. When installed the module requires a Di-Electric silicone grease between the module and the plate it's mounted to. If you buy a new module a small amount of this grease will be included with the module.
You should be able to find diagnostic information for your electrical and ignition system on various "You Tube" videos.
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
LETMGROW is online now   Reply With Quote
Old 06-09-2021, 05:52 PM   #6
Senior Member
 
Join Date: Aug 2020
Location: Ohio
Posts: 307
You say you know some about eng... pull air cleaner off and tell us if carb or fuel injection... then look at distributo and tell us if coil is inside.. then follow fuel lines and tell us if they go straight to the tank or go along front of eng into fuel pump.. please let us know and we will try to help.. good luck..
donr103 is online now   Reply With Quote
Old 06-09-2021, 09:55 PM   #7
Senior Member
 
Join Date: May 2018
Location: Cannon Falls, Minnesota
Posts: 297
Quote:
Originally Posted by donr103 View Post
You say you know some about eng... pull air cleaner off and tell us if carb or fuel injection... then look at distributo and tell us if coil is inside.. then follow fuel lines and tell us if they go straight to the tank or go along front of eng into fuel pump.. please let us know and we will try to help.. good luck..

I think he said he knows nothing. Its TBI for sure. Excuse me if this is rendundant but I would break this down by checking for...

1.) Air (any obstruction in the pie pan/air cleaner housing)
2.) Fuel
Your TBI runs fairly low psi wise compared to a Vortec and may also have a mechanical pump alongside the block. Do you even smell gas from top end? If your friend is a mechanic, has he tested the fuel pressure?
3.) Fire
Pull a plug and wire. Do you see a blue spark when the motor turns over? Do you know if its actually a no spark situation or is it you or your freinds assumption since it cranks but will not start.

I take it you bought this as a project. Good luck and let us know what you find out.
MinntoMich is offline   Reply With Quote
Old 06-13-2021, 01:51 AM   #8
Senior Member
 
Join Date: Aug 2016
Location: Seattle,WA/HB,CA./Fujieda-Japan
Posts: 809
Quote:
Originally Posted by LETMGROW View Post
The very first thing I would check would be the heavy wire plugged into the distributor cap to be sure you are getting 12V. to the distributor when the ignition switch is in the on position. On most passenger vehicles and light trucks this is a red wire with a white connector.
If your friend suspects a faulty ECM (computer) you might want to check with these people for testing before you just run out and buy one:
www.AUTOECMS.com (877) 687 3267 * (570) 883 9930
The pick up coil inside the distributor can be tested with an ohm meter. Some auto parts stores have ignition control module testers. The module would have to be removed to be tested. When installed the module requires a Di-Electric silicone grease between the module and the plate it's mounted to. If you buy a new module a small amount of this grease will be included with the module.
You should be able to find diagnostic information for your electrical and ignition system on various "You Tube" videos.
No on di electric silicone grease for the ICM. The correct substance is 'thermal paste'. The very same paste used on a CPU for a motherboard.

93 TBI fuel pressure should be 9-13 psi. The 94-95 years were 28-32psi.
__________________
1994 Southwind Storm 28ft 7.4L TBI w/ 4L80E P-32
71,405 miles and counting...as of 07/16/2021
VIN#1GBJP37N4R3314754
udidwht is offline   Reply With Quote
Old 07-18-2021, 10:04 PM   #9
Senior Member
 
Join Date: Aug 2016
Location: Seattle,WA/HB,CA./Fujieda-Japan
Posts: 809
Small correction....

1994 - 1995 TBI fuel pressure spec is 26-32psi
__________________
1994 Southwind Storm 28ft 7.4L TBI w/ 4L80E P-32
71,405 miles and counting...as of 07/16/2021
VIN#1GBJP37N4R3314754
udidwht is offline   Reply With Quote
Old 07-18-2021, 11:52 PM   #10
Senior Member
 
D Gardiner's Avatar
 
Join Date: Jan 2018
Location: SF Bay Area
Posts: 594
Quote:
Originally Posted by brianKGuitar View Post
Hi. I know nothing about the combustion engine. Bought a 1993 Pace Arrow 34 foot with a Chevy 454. Chasis batteries and 12v all died over the year. I am new to rv thing, as a pro musician it seemed safe...
Anyway, some fine folks in the park said they knew how to change the batteries. Needless to say, after buying 3 batteries, they caught a 6v and 12v on fire.
Got the power right, a classic car mechanic buddy is doing it, he is a full time mech. It seems now its not getting spark or fuel. We replaced fuses, and got electrical sorted out, it will try to crank but never actually engage. Its a 93, so if the ECM is smoked, I should be able to find a refurbished or something. I read another thread discussing ECMs and I see a few folks who think it might not be...but we replaced fuses, coil on the alternator, burnt cables, batteries...and Im broke lol. Also, the generator, which is gas off the engine, will not engage either.
Thank you for any advice. God bless, drive safe.
First sorry to hear of your troubles.

No spark.
No Fuel.

Definitely not good. I would replace the Ignition control module. Without it working you will never get spark, or trigger the injectors to fire.

Before that is checked. I would got to the ALDL (Assembly Line Diagnostic Link) and check for codes, and see if the ECM (Engine Control Module os functioning.

Many online threads on how to check the ALDL & Codes on the internet. On our 1995 chassis, the ALDL was tucked up high under the dash, (not visible from the instrument cluster access).

The connector (OBD1) On Board Diagnostic Connector should look like this. The standard procedure is to connect terminal A to terminal B, with the ignition key in the On position. If the computer is functioning properly, the code should flash code 12. That would be a single flash followed by two quick flashes. This code is the code for ignition On, No spark. If you get this, the computer is functioning correctly.

If the computer flashes code 12 twice, then it will flash any other stored codes, in the same manner. Once all codes are displayed, the computer will flash code 12 two more times.

Check this and get back with us, with your results.
Attached Images
 
__________________
Always bring your A game.
1996 Flair 29V, 454 TBI, 4L80E
D Gardiner is offline   Reply With Quote
Old 07-19-2021, 07:35 AM   #11
Senior Member
 
Join Date: Aug 2016
Location: Seattle,WA/HB,CA./Fujieda-Japan
Posts: 809
OBD-1 will flash (12 code) 3 times then flash any stored code/s. Then it will end with (12 code) 3 times.
__________________
1994 Southwind Storm 28ft 7.4L TBI w/ 4L80E P-32
71,405 miles and counting...as of 07/16/2021
VIN#1GBJP37N4R3314754
udidwht is offline   Reply With Quote
Reply

Tags
454, chevy, ecm, pace arrow 1993



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Gen 5 454 swap to 1996 L29 454 7.4l Vortec winterbago34 Class C Motorhome Discussions 5 06-15-2019 06:58 AM
NEED HELP, trying to identify this older park model trailer MudiGGer25 Vintage RV's 5 12-29-2016 03:05 PM
1988 Holiday Rambler Chevy 454 Chevy ECM? wajell Vintage RV's 4 05-07-2016 09:31 PM
Older 454 running hot hammer55 Vintage RV's 7 08-20-2014 08:59 PM
Older Cardinal vs older Cedar Creek golden_eagle 5th Wheel Discussion 5 05-28-2013 08:28 PM


All times are GMT -6. The time now is 03:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.