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The other question is............

 

Is the gas Fresh???

 

Or has this MJ been sitting for a couple months and the gas went south.

 

You really need to check if you have fuel pressure at the rail, and If you have spark (leading to a bad CPS)

 

After you check a few items, get back and report what you find.

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What's this........With a '90 XJ........

 

"Checked with DRB II Scanner........."

 

:rotfl2:

 

"......Showed no stored trouble codes......"

 

:rotf:

 

Where they plug the code reader in..........the cigarette lighter???? :doh:

 

Seams like a nice quick $80 diagnostic charge :roll:

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........With a '90 XJ........

Actually it was for my '90 MJ, shows you how much the Service Manager knew.

 

Seams like a nice quick $80 diagnostic charge :roll:

Yeah, that was in '94, I was naive back then, plus this site didn't exist (for that matter very few sites)!!! :rotfl2:

 

"Checked with DRB II Scanner......Showed no stored trouble codes......"

What scan tool is used to connect to the 6 way (D1) and 15 way (D2) diagnostic connectors that are between the relays and the coolant bottle? I know codes are not stored, but I thought there were real-time outputs.

 

And back to the original question, can you hear your fuel pump prime every time regardless if it starts or not? I had a loose harness connection by the e-brake causing intermittent fuel pump issues.

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What is used to connect to the 6 way (D1) and 15 way (D2) diagnostic connectors that are between the relays and the coolant bottle? I know codes are not stored, but I thought there were real-time outputs.

They are. You probe each one with a multimeter. The Renix system does NOT store trouble codes. You got hosed for an $80 diagnostic that they could not possibly have run.

 

And back to the original question, can you hear your fuel pump prime every time regardless if it starts or not? I had a loose harness connection by the e-brake causing intermittent fuel pump issues.

Not necessarily. The pump stops running when the pressure in the fuel rail reaches the required pressure. If you try to start and get a fail to fire, walk away, then come back and try again before the pressure has bled down sufficiently, the fuel pump may not need to run ... so you won't hear it.

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........With a '90 XJ........

Actually it was for my '90 MJ, shows you how much the Service Manager knew.

 

Seams like a nice quick $80 diagnostic charge :roll:

Yeah, that was in '94, I was naive back then, plus this site didn't exist (for that matter very few sites)!!! :rotfl2:

 

"Checked with DRB II Scanner......Showed no stored trouble codes......"

What scan tool is used to connect to the 6 way (D1) and 15 way (D2) diagnostic connectors that are between the relays and the coolant bottle? I know codes are not stored, but I thought there were real-time outputs.

 

And back to the original question, can you hear your fuel pump prime every time regardless if it starts or not? I had a loose harness connection by the e-brake causing intermittent fuel pump issues.

Mike-Interesting conversation about this here

 

http://www.naxja.org/forum/showthread.php?t=71302

 

Looks like a Renix code reader did in fact exist, but like has been said no stored codes. In 1994 Comancheclub probably would have been a chatroom in AOL, or a dialup BBS which I am pretty certain didn't exist, I love and appreciate this site! image_209027.gif

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They are. You probe each one with a multimeter. The Renix system does NOT store trouble codes. You got hosed for an $80 diagnostic that they could not possibly have run.

I know codes are NOT stored and they would still charge me for the diagnosis no matter what they used scanner or multimeter or ...

 

And back to the original question, can you hear your fuel pump prime every time regardless if it starts or not? I had a loose harness connection by the e-brake causing intermittent fuel pump issues.

Not necessarily. The pump stops running when the pressure in the fuel rail reaches the required pressure. If you try to start and get a fail to fire, walk away, then come back and try again before the pressure has bled down sufficiently, the fuel pump may not need to run ... so you won't hear it.

Sorry, I thought it was implied to listen upon initial attempts after sitting when the key is turned to the Acc position (first click), hard to hear the pump prime while cranking.

 

Thanks Joe, interesting read. Funny, Eagle posted on that thread also.

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Sorry, I thought it was implied to listen upon initial attempts after sitting when the key is turned to the Acc position (first click), hard to hear the pump prime while cranking.

The "Accesory" position is not the first click. Accessory is the opposite direction from the Run and Start positions, and does not energize either the fuel pump or the ignition. The first click toward "Start" is "Run," not "Acc."

 

The fuel pump does run with the key in the "Run" position -- IF the pressure in the fuel rail has bled down enough to need it. If you park overnight and turn the key on (to "Run") you'll typically hear the fuel pump run for 2 to 4 seconds, until it builds pressure. If I drive one of my trucks home, shut it down, and a few minutes later turn the key to "Run," the pressure is still up and the fuel pump does not run.

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Yeah, that was in '94, I was naive back then, plus this site didn't exist (for that matter very few sites)!!! :rotfl2:

 

I meant no harm by my statement, I too was naive in '94, and didn't know anything about the MJ's back then, only over the past 7 years have I've gotten into these beasts.

 

In fact........I don't think I was even on the www until '96-'97 (after Al Gore Invented it) :teehee:

 

I know how it is, the vehicle is broken down, and your at the mercy of a repair shop, and well.......your fresh meat to them.

 

bottom line is.........a voltage meter is the best diagnostic tool for the Renix system.

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Sorry, I thought it was implied to listen upon initial attempts after sitting when the key is turned to the Acc position (first click), hard to hear the pump prime while cranking.

The "Accesory" position is not the first click. Accessory is the opposite direction from the Run and Start positions, and does not energize either the fuel pump or the ignition. The first click toward "Start" is "Run," not "Acc."

 

The fuel pump does run with the key in the "Run" position -- IF the pressure in the fuel rail has bled down enough to need it. If you park overnight and turn the key on (to "Run") you'll typically hear the fuel pump run for 2 to 4 seconds, until it builds pressure. If I drive one of my trucks home, shut it down, and a few minutes later turn the key to "Run," the pressure is still up and the fuel pump does not run.

 

How does the pump "know" that there is pressure in the rail? There are no pressure sensors in the fuel system. There is no feedback from the pump to the ECU.

 

Also, there is a Jeep/ Eagle adapter kit that allows the DRB II to connect with the Renix system through the two connectors. It came with adapter boxes, cables and DRB II cartridges for the 87 to 90 Jeeps and the Mitsu products. If you would like I could post a pic sometime of the set up. The dealer I was at was throwing out all the "old, obsolete" tools a while back, and I managed to grab a couple of DRB II's and adapter sets. :D If you check e-bay the stuff shows up occaisionally.

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