Re: Help I\'am stranded again

You could do one of two things, buy some contact cleaner and clean the connectors then use waterproof electrical grease and wait for awhile until it does it again. OR you can chop the connector off of it completely and solder the wires together or use some butt connectors with heatshrink.

 

Re: Help I\'am stranded again

Could Be The Timing?

 

Re: Help I\'am stranded again

On the 4.0 there really isn't any timing adjustments you can do, the only advance or retard of timing that can be done is with by either modifying the brackets on the CPS or buying a high altitude one, which just advances it slightly. Unless the timing chain was shot but usually when they go...they just go.

 

Re: Help I\'am stranded again

how expensive is the high altitude one and how hard is it to change? I need that! But i Want to keep my old one so ii can switch it out if i get stationed some place else...

 

Re: Help I\'am stranded again

If the new sensor doesn't help, I agree with AJ. SOmething before the sensor is sour. Trace to wires and look for corrosion and cracks. Loose or corroded wires at the main plug is also possible.

 

Re: Help I\'am stranded again

I an still not runnining. I have spark. I have no fuel pressure. There is no power at the fuel pump. What do I do next? Is there a fuel pump relay?

 

Re: Help I\'am stranded again

Yep..could be a fuel pump relay (located passenger side in engine compartment) Could also be a bad ground on your fuel pump (should be a black wire leading from the tank /fuel pump to ground...I'd check this first)

Do you hear the fuel pump run for 1-3 seconds when you turn the key to the "on" position..If Not then its most likely the relay. If yes then it could be a bad ground (causing an intermittant no-start / stop condition.

there is also a vacuum actuated fuel pressure regulator on the end of the fuel rail (toward front of engine).

Good luck...did ou get the PDF file on the RENIX MPI system?

MsT

 

Re: Help I\'am stranded again

Good luck...did ou get the PDF file on the RENIX MPI system.
No idi not. Were can I dounload it?
There are three relays on the passenger side. Which one is the fuel pump? The ground is good. The fuel pump does not run when the key is first turned on. There is no power at the fuel pump connector.

 

Re: Help I\'am stranded again

Do a search on Renix Fuel Injection and you'll find the link to the manual. The fuel pump relay is the third one from the left.

 

Re: Help I\'am stranded again

Thanks to all posters, everyone was helpfull.
The Renix manuel did the trick,I just wish I had it before I bought $31.00 worth of useless HAYNES manuels.The fuel pump relay was the problem,AUTOZONE swore I did not even have a fuel pump relay. I also own a 1976 cj5 304 is there anywhere there are some good manuels for these? I will post this question to the short wb also.

 

Re: Help I\'am stranded again

I had no idea how long I was fighting this problem until I looked this thread up.
The relay in the last post did not do the trick.
We had given up on fixing the problem and parked if after changing the ECU, fuel pump, filter, relay sockets.
I started running tests again last week and finely found that at some time a mechanic has stuck one of those test lights into the lead wire from the fuel pump, that tiny little hole in the wire caused it to corrode in two.
I found it more by feel because the wire looked fine but it had a limp spot in it.

 

Re: Help I\'am stranded again

Click here for manuals.

Very good you found the corroded wire. I once had this in a motorcycle. Almost impossible to find... /ubbthreads/images/graemlins/applause.gif

 

Re: Help I\'am stranded again

My mj drove me nuts. It would stall, then start after a few hours sometimes wouldn't start. Turned out to be a ground. I cleaned the firewall ground and ran a seperate ground right to the fuel pump ..... all the gremlins disappeared. If gauges are going wonky ... check grounds.

Hope this helps.
Kevin

 

Re: Help I\'am stranded again

Wondering if you had 2 problems, still have one.

You said: """"None the less if you unplug the crank shaft sensor and plug it back in it will start and run fine for a day a week or a month you never know.""""

How's that going to fix the broken/corroded wire in the fuel pump circuit? Isn't that on the other side?

But - you may have the same problem with the crank sensor harness, the wiring side of it, not the sensor side of the connector. It swings in the breeze. If a yo yo was probing through the insulation, he may have probed it there too.

 

Re: Help I\'am stranded again

[ QUOTE ]
Wondering if you had 2 problems, still have one.

You said: """"None the less if you unplug the crank shaft sensor and plug it back in it will start and run fine for a day a week or a month you never know.""""

How's that going to fix the broken/corroded wire in the fuel pump circuit? Isn't that on the other side?

But - you may have the same problem with the crank sensor harness, the wiring side of it, not the sensor side of the connector. It swings in the breeze. If a yo yo was probing through the insulation, he may have probed it there too.

[/ QUOTE ]

That was the first thing replaced along with cleaning all the connectors, that did help at first so there were two problems, no doubt. /ubbthreads/images/graemlins/smile.gif