• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

4.0 idles better with MAF unplugged


Acgallen

Well-Known Member
V8 Engine Swap
Joined
Feb 20, 2020
Messages
97
City
PA
Vehicle Year
1992
Engine
Transmission
Manual
I have a slightly modified 1992 4.0, bigger throttle body, injectors and MAF housing. I had the original setup working before it came out and went into the Bronco 2, so i used all my original parts. ECT sensor reads in range, as does TPS. Out of the 3 MAF's i have, my 5.0 MAF responds best to throttle(Which was the original MAF). It almost idles like it has a cam, but when i unplug the MAF, it idles like a dream. Since i swapped into a 85' B2 i have no Tachometer to tell yall what my idle RPM's are. If i could post a video, i have comparisons of the idle. Im sure RonD has probably solved this a few times but i cannot seem to find a forum that has this issue. Honestly its not a huge deal, but it does get a little annoying to have to keep it alive when cold starting. Runs and starts like a dream when warm. TIA
 
That tells me the problem is the MAF. When it's unhooked the PCM defaults to speed density programming and runs fine.
 

Sponsored Ad


Sponsored Ad

TRS Events

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Ranger Adventure Video

TRS Merchandise

Follow TRS On Instagram

TRS Sponsors


Sponsored Ad


Sponsored Ad


Amazon Deals

Sponsored Ad

Back
Top