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2003 4.0l ranger v8 swap, need help with       #: 2580
 Moderated by: Mike69, MaDMaXX, Page:  First Page Previous Page  1  2   
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 Posted: Thu Dec 8th, 2022 07:06 pm
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26th Post

Owns A Torsen

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The heater circuit might be a fuse. It is a relatively high amperage fuse, it is PROBABLY marked "HEGO" . I would check where the O sensors are connected, see if a wire is pulled.

I'm pretty sure the upstream and downstream are the exact same sensor, perhaps with different length connectors. Borrow one of your downstreams and switch them out.

If you can get them out.

The thing is... none of those would cause it to run like it does. You're missing something very simple I bet like a one wire thing.

A MAP sensor would do that too... I don't think they started map sensors till 2001.

I'm kinda lost without 2 full manuals.

00 XLT 4WD RCSB 3.GO! JalapeƱo
01 XLT 2WD RC Steppie 3.0 auto Silver
The future belongs to those who show up.
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 Posted: Fri Dec 9th, 2022 03:52 pm
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went ahead and checked my plug wire order, condition, and made sure i was getting spark at each cylinder. unplugging each cylinder one by one resulted in an obvious change, so pretty sure those are in order.

Checked for a vacuum leak, sprayed all the possible leakage points to see if there was any change in idle, nothing changed.

hope to be able to check fuel pressure soon.

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