fox body idle

ulloajgt · Aug 19, 2018

hello need help i have a 89 notchback and im having idle problems i checked tps sensor and its reading .964 volts and 4.8 a wot and its starts to surge also if i step on the on the gas pedal and keep a steady rpm for example 3000 rpm i can see my tach surging any ideas thanks for the help.

mods are stock 302 edelbrock performee rpm heads 170 ported trick flow track heat intake trick flow stage 2 cam 30 lbs injectors and maf sve throttle body

General karthief · Aug 19, 2018

Ok, I'll let you in on a secret, in the 5.0 tech forum, I gently moved you question over here, on the main page you will see 5.0 technical/how to thread, there you will find a list of things that will help your stang run better, jump higher and look good doing it. In that list you will see the 'surging idle checklist ' read through it, then go step by step, take notes and it will help you resolve you problems, one of the first things will be to check for codes, you likely will find more than one so if you have any questions post them in this thread and the members will help you with answers. Do the steps one by one, don't jump around, it was put together by a wizard (jrichker) that sits in a tower wearing a long pointy hat and spends his off times casting spells on unsuspecting prius owners.
Welcome to stangnet.

Mustang5L5 · Aug 19, 2018

TPS fine.

Is that combo tuned? Surging at low rpm tends to be typical of non-tuned TFS cam combos

jrichker · Aug 19, 2018

You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the Surging Idle Checklist. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without spending a lot of time and money. It includes how to dump the computer codes quickly and simply as one of the first steps. I continue to update it as more people post fixes or ask questions. You can post questions to that sticky and have your name and idle problem recognized. The guys with original problems and fixes get their posts added to the main fix.

It's free, I don't get anything for the use of it except knowing I helped a fellow Mustang enthusiast with his car. At last check, it had more than 250,000 hits, which indicates it does help fix idle problems quickly and inexpensively.

ulloajgt · Aug 19, 2018

Mustang5L5 said:
TPS fine.

Is that combo tuned? Surging at low rpm tends to be typical of non-tuned TFS cam combos

not tuned i did all the idle check list and got it to idle a little better what i notice was that if i disconect the iab/iac it does not affect the car at all i replaced it with a new motorcraft unite an still nothing

jrichker · Aug 20, 2018

ulloajgt said:
not tuned i did all the idle check list and got it to idle a little better what i notice was that if i disconect the iab/iac it does not affect the car at all i replaced it with a new motorcraft unite an still nothing

Someone set the base idle speed by using the throttle stop screw. See the Surging Idle Checklist link that I posted to find the correct way to set the base idle speed.

fox body idle

ulloajgt

New Member

General karthief

wonder how much it would cost to ship you a pair

Mustang5L5

That is…until I whipped out my Bissell

jrichker

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ulloajgt

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jrichker

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fox body idle

ulloajgt

New Member

General karthief

wonder how much it would cost to ship you a pair

Mustang5L5

That is…until I whipped out my Bissell

jrichker

StangNet's favorite TOOL

ulloajgt

New Member

jrichker

StangNet's favorite TOOL

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