Stand alone HEI Conversion 87
Thread Starter
Intermediate
Joined: Nov 2012
Posts: 49
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From: Westland MI
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?
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?
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 12
What issues?
Unlikely it would run with a non CC HEI ( and the TPI ) because the ECM needs the input signal from the dist in order to fire the injectors
Unlikely it would run with a non CC HEI ( and the TPI ) because the ECM needs the input signal from the dist in order to fire the injectors
Racer
Joined: Nov 2012
Posts: 375
Likes: 0
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?
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?
Thread Starter
Intermediate
Joined: Nov 2012
Posts: 49
Likes: 0
From: Westland MI
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 12
Fuel pump is fine ,will run off the OP switch; it is the injectors that rely on the signal to the ECM from the dist.
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
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
Thread Starter
Intermediate
Joined: Nov 2012
Posts: 49
Likes: 0
From: Westland MI
[QUOTE=Rohn;1584432114][QUOTE]I would like to make it a stand alone type HEI.
Why?
Because every TPI I have seen has issues with hard starting.
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.
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.
Last edited by Scotts97C4; Jul 17, 2013 at 05:20 PM. Reason: typo
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Safety Car
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From: Glenbeulah Wi
Thread Starter
Intermediate
Joined: Nov 2012
Posts: 49
Likes: 0
From: Westland MI
Then check fuel presure it runs at 39 psi., then leak down went to 37 psi over night.