Fidle on a Chevy engine
Posted: Wed Jul 30, 2014 12:34 am
Hi guys. I’ve been using old GM TBI systems to get great mileage from all of my cars. But one of my buddies asked if I could fuel inject his old car a 1972 Manta Mirage, not for mileage, but do it for power and reliability. I said yes. Anyway, a Manta is a 350 Chevy in an 1800 pound CanAm style car. Some years ago he spent a bunch of money to get this car fuel injected by the Edelbrock Factory shop. But it was never right. He was never happy with it. He took the car to Edelbrock and paid them to do the job properly back then. And he took it back 4 times to get it right. He was never happy with the way it ran and hasn’t been driving it for a couple of years.
OK, so here I am. I had him order the MS-II 3.57 ‘squirt. I put in 2.886 and went to work just like I had done on other engines before.
BUT the Edelbrock system uses a Ford style 2-wire PWM IAC. The megamanual says the MS-II 3.57 ‘squirt can handle the PWM IAC without any transistor mods. So far so good.
But I’ve never wired up a PWM IAC before. I’ve always used the Fidle for relays and other switches and stuff. Since the Edelbrock has a PWM IAC, I figured I'd use the ‘Squirts Fidle wire. It should be a piece of cake.
OK maybe it isn’t such a piece of cake. Come on, it's only 2 wires. How hard can it be??? but it's beating me now.
I set the bins for setting of 10 to 100. My assumption is that the idle should get faster or slower as the engine warms up. (If faster I’ll reverse the settings.) I set the frequency to someplace around 320. But nothing happens. No noise or vibration from either PWM valve (I tried two).
Did I miss something? Anybody have some rough guesses on a Ford 2 wire PWM valve?
I should be able to get this to work easily... It's only 2 wires...
Here's an MSQ with my settings. Thank you for having a look.
By the way. Computers hate me. They cry when I get near them.
Thanks guys
Holl
OK, so here I am. I had him order the MS-II 3.57 ‘squirt. I put in 2.886 and went to work just like I had done on other engines before.
BUT the Edelbrock system uses a Ford style 2-wire PWM IAC. The megamanual says the MS-II 3.57 ‘squirt can handle the PWM IAC without any transistor mods. So far so good.
But I’ve never wired up a PWM IAC before. I’ve always used the Fidle for relays and other switches and stuff. Since the Edelbrock has a PWM IAC, I figured I'd use the ‘Squirts Fidle wire. It should be a piece of cake.
OK maybe it isn’t such a piece of cake. Come on, it's only 2 wires. How hard can it be??? but it's beating me now.
I set the bins for setting of 10 to 100. My assumption is that the idle should get faster or slower as the engine warms up. (If faster I’ll reverse the settings.) I set the frequency to someplace around 320. But nothing happens. No noise or vibration from either PWM valve (I tried two).
Did I miss something? Anybody have some rough guesses on a Ford 2 wire PWM valve?
I should be able to get this to work easily... It's only 2 wires...
Here's an MSQ with my settings. Thank you for having a look.
By the way. Computers hate me. They cry when I get near them.
Thanks guys
Holl
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