wont run under load good at all ;(

[shouldaboughtajeep]

hi every one i need aome help i start my truck it runs great i floor it through first gear it runs great after that it run OK up to 3000 rpms then boggggs and miss fires and continues to get worse after the can some body help me please idk where to begin i replaced roter and cap and wires and plugs 4 to 5 months ago also replaced fuel filter a few days ago

 

[BroncoJoe19]

put a vacuum guage on it, should be between 18-22 inches. Run the engine up to 2000 rpm and see if the vacuum drops. If so you likely have a clogged CAT.

HowTo diagnose a plugged catalytic converter

BogHog... Use a vacuum guage, good explanation.

http://www.ford-forums.com/ford-ranger/43930-97-ranger-cylinder-head.html#post165883

Another suggestion by BogHog was to remove the O2 sensor in front of the Cat (which will allow the exhaust gases an avenue of escape) and see if the engine runs better. If it does, the Cat is plugged.

Plugged Cat test with pressure guage...

 

[shouldaboughtajeep]

put a vacuum guage on it, should be between 18-22 inches. Run the engine up to 2000 rpm and see if the vacuum drops. If so you likely have a clogged CAT.

HowTo diagnose a plugged catalytic converter

BogHog... Use a vacuum guage, good explanation.

http://www.ford-forums.com/ford-ranger/43930-97-ranger-cylinder-head.html#post165883

Another suggestion by BogHog was to remove the O2 sensor in front of the Cat (which will allow the exhaust gases an avenue of escape) and see if the engine runs better. If it does, the Cat is plugged.

Plugged Cat test with pressure guage...

i tryed tht it does not run ny better ;/

 

[BroncoJoe19]

what are your vacuum readings?

 

[BroncoJoe19]

What year, and engine do you have?

What have you done to troubleshoot it?

When was the last tune up? What did it include?

What else can you tell us?

Please spell completely, I don't cell phone text, and hate abbreviations that I need to figure out.

 

[andre]

caul be bad coil mat sensor grouwn ext need year like joe ask you may be able to help you more

THK YOU

 

[shouldaboughtajeep]

caul be bad coil mat sensor grouwn ext need year like joe ask you may be able to help you more

THK YOU

its a 1989 ford bronco 5.0 i can rev it fine to high rpms just getting there is the problem its sounds like a motor thats getting to much air you know

 

[BroncoJoe19]

Why didn't you anwer the rest of my questions?

And here's one more, did you check your CAT? and IF SO... How?