Michael Snipes
Probationary Member
- 14
- 1
- May 20, 2020
-
Tucson,
Arizona
I have a 420a with a custom manifold and when I hit boost it will stutter when it switches from vac-boost. Then I’ll get a really bad fuel cut around 4500 rpms. Please help.
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You are probably running rich or have a bad air leak somewhere how have you tuned the car and what other upgrades?I have a 420a with a custom manifold and when I hit boost it will stutter when it switches from vac-boost. Then I’ll get a really bad fuel cut around 4500 rpms. Please help.
No tune. I got the cat how it sits and yes I’m assuming to lean. But what do I do. It’s 2020. I can’t afford ms right now. Missing link is like unheard of. Fcd are out of service. So should I get a adjustable fpr?You are probably running rich or have a bad air leak somewhere how have you tuned the car and what other upgrades?
Do you know a How to video or no?I've had better luck with electronic FCD's. There's a used HKS unit for under $50 here:
https://www.ebay.com/itm/HKS-Fuel-Cut-Defencer-FCD/254460367706
I've also seen a few HKS knockoffs on AliExpress for about the same price.
There's actually an S-FMU--which will give you more flexibility than an FMU--listed for $150 shipped right now, which is a pretty good price:
https://www.ebay.com/itm/Vortech-Super-Fuel-Management-Unit-s-fmu-sfmu/333742251395
Just FYI, you will destroy your engine if you try running boost without some way to also control fuel, whether it's an FMU or otherwise. Adding an FCD without fuel management is asking for trouble.Thank you so much. I probably can’t get the sfmu yet but the fuel cut defender I should be able to get.
No, but there must be a million threads about how to install FCD's and FMU's in these forums.Do you know a How to video or no?
The same as what? It should work for your application. It looks like an older model, but I was trying to find something cheap for you.And that doesn’t look like the correct fcd. Is it the same?
Just FYI, you will destroy your engine if you try running boost without some way to also control fuel, whether it's an FMU or otherwise. Adding an FCD without fuel management is asking for trouble.
No, but there must be a million threads about how to install FCD's and FMU's in these forums.
The same as what? It should work for your application. It looks like an older model, but I was trying to find something cheap for you.