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Amedee
Amedee, Jeep Technician
Category: Jeep
Satisfied Customers: 25855
Experience:  ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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I have a 95 yj and once it warms up i loose power, 1995 jeep

Customer Question

i have a 95 yj and once it warms up i loose power
JA: What is the model/year of your Jeep?
Customer: 1995 jeep wrangler yj 2.5l
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: have replaced almost everthing
JA: Anything else you think the mechanic should know?
Customer: the local dodge delership is at a loss
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Jeep Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Jeep
Expert:  Amedee replied 1 year ago.

Hello and welcome! My name isCustomerand I can assist you with your question. What has been replaced for this already?

Customer: replied 1 year ago.
I have replaced all the sensors exhaust, plugs distrubitor, rotor plugs wires and just about everything else the delership is not even sure what is going on. everything runs great untill after about 15 minutes then it starts bogging down
Expert:  Amedee replied 1 year ago.

So was the fuel pump replaced?

Customer: replied 1 year ago.
tank was pulled drained everything in it replaced from tank to rail
Expert:  Amedee replied 1 year ago.

Excellent! So what is the fuel pressure under a load?

Customer: replied 1 year ago.
35 to 40
Customer: replied 1 year ago.
the shop says everything checks out like its supposed to
Customer: replied 1 year ago.
compression fuel pressure everything is where its supposed to be
Expert:  Amedee replied 1 year ago.

Right, I understand. Of course they are going to say that. What is the engine vacuum at?

Customer: replied 1 year ago.
im not sure but they said it was good the motor maybe have 30 000 miles on it
Expert:  Amedee replied 1 year ago.

So did they check for plugged exhaust?

Customer: replied 1 year ago.
not yet but its all new from manifold to tailpipe three days old
Expert:  Amedee replied 1 year ago.

Ok, have them check engine vacuum at idle and under load (or at 2000 RPM) and let me know. Also, have them take a oxygen sensor reading UNDER A LOAD. Let me know.

Customer: replied 1 year ago.
ok will do
Expert:  Amedee replied 1 year ago.

Thank you!

Customer: replied 1 year ago.
All cylinders were tested and found to be 175 cold and hot fuel pressure regulator was replaced and found to be in range fuel pressure was 31 and 46 wide open
Customer: replied 1 year ago.
it is now very slugish even at cold run and acting like it dosnt want to move as well
Customer: replied 1 year ago.
you still there????
Expert:  Amedee replied 1 year ago.

Hello! Sorry for the delay! Just got home from work. What were the readings of the tests I was inquiring about?

Customer: replied 1 year ago.
presure test where at 175 cold and hot
Customer: replied 1 year ago.
fuel was 31 and 46
Customer: replied 1 year ago.
we have replace the distibuter as well and no change
Expert:  Amedee replied 1 year ago.

Ok, but you still have not answered my question.

Customer: replied 1 year ago.
all the said was that the oxygen was within limits
Expert:  Amedee replied 1 year ago.

They need to look closer. Do they know if the engine is running lean or rich under a load?

Customer: replied 1 year ago.
they said lean
Expert:  Amedee replied 1 year ago.

There ya go! You have a fuel delivery problem.

Customer: replied 1 year ago.
everything in new from the tank back what should i look at
Expert:  Amedee replied 1 year ago.

What sensors were replaced? Please list ALL OF THEM THAT WERE REPLACED

Customer: replied 1 year ago.
map sensor, oqygen sensor, throttle position sensor,speed sensor
Expert:  Amedee replied 1 year ago.

Were the injectors replaced? Maybe you just have bad fuel injectors.

Customer: replied 1 year ago.
they were not replaced they were checked and found to be spraying correctly and evenly
Expert:  Amedee replied 1 year ago.

Then how can the engine be running lean under a load?

Expert:  Amedee replied 1 year ago.

It sounds like I am not getting all of the information here.

Expert:  Amedee replied 1 year ago.

Conflicting/missing information. Something is clearly not adding up.

Customer: replied 1 year ago.
ok maybe it wasnt lean maybe it was rich. they really didnt have alot of information to pass im looking through there paperwork and it
Expert:  Amedee replied 1 year ago.

You might want to call them and speak with them. I need to know if the engine is rich or lean WHEN it bogs down and I need to know the engine vacuum readings at idle and at 2000 rpm.

Expert:  Amedee replied 1 year ago.

Also, find out how they installed the distributor. If it is not indexed correctly, it will not run right

Customer: replied 1 year ago.
engine vacum was 175 at iddle and under load from what they say
Expert:  Amedee replied 1 year ago.

No internal combustion engine that is street legal can produce 175 inches of vacuum. You might be talking about compression. However, that is not what I am asking. I need the engine VACUUM READINGS. NOT COMPRESSION READINGS

Customer: replied 1 year ago.
OK now we are on the same page I will have to call them Monday and find out what they were
Expert:  Amedee replied 1 year ago.

Sounds good.

Customer: replied 1 year ago.
Thank you
Expert:  Amedee replied 1 year ago.

Your welcome