Stand alone HEI Conversion 87
On my 87 base coupe auto with a new 350ci/330hp Crate Engine.
I'm having issues with the external spark control. I would like to make it a stand alone type HEI. I tried changing the module to the old style 2pins on each side. And it worked great for about 8 sec's then the car died. I figure its tied into the ECM and it shut it down. (It was amazing the car started before I stop'd turning the key.) Has anyone else done this conversion? |
Originally Posted by Scotts97C4
(Post 1584418402)
I'm having issues with the external spark control.
Originally Posted by Scotts97C4
(Post 1584418402)
I would like to make it a stand alone type HEI.
Has anyone else done this conversion? |
Originally Posted by Scotts97C4
(Post 1584418402)
On my 87 base coupe auto with a new 350ci/330hp Crate Engine.
I'm having issues with the external spark control. I would like to make it a stand alone type HEI. I tried changing the module to the old style 2pins on each side. And it worked great for about 8 sec's then the car died. I figure its tied into the ECM and it shut it down. (It was amazing the car started before I stop'd turning the key.) Has anyone else done this conversion? |
Originally Posted by My1991
(Post 1584418435)
You originally had hei/est no way to make the ecm control spark on a hei with vacuum advance.
I'll just degree it in and run it that way. Does MSD have a conversion? |
Your ECM needs distributor feedback to run the fuel pump. It won't run well with no
advance, the system is too integrated to just throw away. |
Originally Posted by Benny42
(Post 1584424011)
Your ECM needs distributor feedback to run the fuel pump. .
Alternative is to install the F.A.S.T EZ system that has electronic fuel control with a non CC dist so you can run purely mech advance like the OP wants to |
[QUOTE]I would like to make it a stand alone type HEI.
[QUOTE] Why? |
[QUOTE=Rohn;1584432114][QUOTE]I would like to make it a stand alone type HEI.
Why? It Shouldn't take 2 seconds or more to start the engine. When I changed it to the stand alone it started as soon as the engine started to turn over. The extrenal spark control lacks to say the least. I did the same thing to an older chevy and it made a hugh differnce. But it didn't have the spark control on board the ecm. |
That may be related more so to fueling. I was not aware of any deficiencies in the GM HEI/ESC. As good as aftermarket.
|
Originally Posted by Rohn
(Post 1584432926)
That may be related more so to fueling. I was not aware of any deficiencies in the GM HEI/ESC. As good as aftermarket.
|
Originally Posted by bjankuski
(Post 1584432959)
I agree, this is a fueling issue, you probably need more cranking fuel. If the fuel is dialed in correctly it will start immediately.
Then check fuel presure it runs at 39 psi., then leak down went to 37 psi over night. |
The engine is not stock it probably needs more cranking fuel in the tune then the stock engine. You could also have a bad cold start injector.
|
All times are GMT -4. The time now is 08:24 PM. |
© 2024 MH Sub I, LLC dba Internet Brands