Slowly dies...uphill


Vanguy16

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Hello everyone.

I recently purchased a used 1994 Mazda b4000. I have cleaned the MAF and IPS. I was about to go on a trip a few weeks later and drove about 80 miles or so on mainly flat surfaces with small increases in rise and drops and started to drive up a fairly steeper grade hill. The truck was in 5th gear (manual tranny), and it started to bog down...so much so that no matter of taking the foot off the gas and back in would help, had to lower gears and eventually come to a complete stop. Started on again and now.am going through a mountain pass and this happened twice throughout my trip. I got through the mountain pass and turned around and nursed her home. There's goes the reliability factor...considering I had MANY more miles to go and now don't have the slightest confidence going anywhere far.

Ideas? Suggestions?

I believe the fuel filter has been changed recently..don't visibly see any hose cracks or degraded hoses...
 


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Vanguy16

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A quick update would be that I have driven this truck around the city for a few months without any an issue before this...
 

RonD

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Could be fuel filter or pump, "I think fuel filter is new" is not a new filter, $15 to replace, your choice

Could be exhaust is partially blocked, Cat or muffler broken inside, you can test for this with vacuum gauge

Vacuum gauge can also test if engines compression is OK

Read here: https://www.gregsengine.com/using-a-vacuum-gauge.html

$20 vacuum gauge is one of the better tools to have.

No matter how many sensors they add to it, a gasoline engine is STILL a self power AIR PUMP, and you test pumps by testing pressure
 

Vanguy16

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If exhaust or cat is, say, damaged in someway or causing this, wouldn't it do it in all gears then?

Thanks for the reply Ron
 

RonD

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It would do when air flow OUT started to back up, so more RPM based, but only under load

If feels similar to "running out of gas", i.e dirty fuel filter
 

Vanguy16

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Update: only does it in fifth Gear...

So today I started the truck up and idled it and went underneath and found two pretty small air leaks in the first CAT canister closest to the engine.
Just a small amount of air seeps out under idle.
 
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