New fuel pump, didnt help, what next? - Defender Source
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  #1  
Old March 31st, 2013, 07:17 PM
wantone
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Rick Thompson
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New fuel pump, didnt help, what next?

Hello gents. Recently my truck started to miss after about 15 min of driving. Misses throughout the rpm range intermittantly & not consistent. Idles & starts fine & does not stall out. In the last 6 months i have put on new alternator, ingnition module, cap/rotor, plugs, new battery grounds, fuel filter & today a fuel pump. Cleaned the pvc pipes/hoses. Has been running great until last week. I first changed the fuel filter & today the fuel pump. I even put back on the old ignition module & cap/rotor & no change. What next? I have new plug wires coming, could they be causing this? Very frustrated... Been making a list to just carb it...

Thanks!
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  #2  
Old March 31st, 2013, 07:38 PM
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Jeff B
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I went through this with my 3.9 for over a year.
Changed many of the same things you have.
Finally swapped the ECU out of another truck and the "stalling" was magically moved to the other truck!
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Old March 31st, 2013, 07:47 PM
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Throttle position sensor would be my next guess. Also, make sure that the spade connector on your ignition module is holding on tightly. I converted the one on my old truck to a ring connector after similar problems.
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Old March 31st, 2013, 08:00 PM
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you can test the TPS really easily ... with a non digital multi meter - check the resistance swings smoothly when you open the throttle ( engine off obviously ). If you get a nice smooth response then it's OK. If it jumps around then its f'd.

Is it actually missing ... or is it hesitant and lumpy? For even combustion you need Air ( air hoses etc, fuel and spark ). Have you checked all the air for leaks? Use a leak testor or spray carb cleaner and see if the revs drop.

don't carb it ... thats just asking for a whole bunch of issues.

Have you thought of putting some test gear on it ... Rover gauge would be a good start ... it would test the TPS and let you see the revs drop more accurately.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old March 31st, 2013, 09:34 PM
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Ill check the tps, thanks. It cuts out, hard to tell if it is spark or fuel cause it happens so quickly. Would old plug wires do this? I realized i have about 50k on my wires & i have new ones on the way
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Old March 31st, 2013, 11:44 PM
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Quote:
Originally Posted by wantone View Post
Ill check the tps, thanks. It cuts out, hard to tell if it is spark or fuel cause it happens so quickly. Would old plug wires do this? I realized i have about 50k on my wires & i have new ones on the way
Lots of things can do it ... Can you describe the exact symptoms?

Do you have any codes on the ECU readout?
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old April 1st, 2013, 09:45 AM
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the readout is blank, i really dont think it functions as i have never really seen any readout on it, one time i saw a faint 00. the symptoms are it starts right up and runs great for about 15 minutes, then it will start to intermittantly stumble and sometimes pop and jerk during acceleration. i did notice yesterday it ran great, then i sat and it idled for a few minutes then started to act up and it seemed that as i ran it more, it started to run a bit better but not normal.
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Old April 1st, 2013, 09:54 AM
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ok ... i would give the connectors a good clean with electrical cleaner including the one for the ECU. You should get a bright display of 00 on startup ... or 02 after a reset.

Check to see if you get this ... if you don't it could be indicative of low voltage to the ECU ... if you are handy with a PC take a look at Rovergauge .... it would measure the voltage that the ECU sees .... very important here.

next spray carb cleaner on all your air hoses and joints ... popping tends to be related to air fuel mix being wrong ...
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old April 1st, 2013, 10:31 AM
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thanks jason! i will give her a go at lunch time. you mean pull the big long connector off the ecu at the floor well correct?
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Old April 1st, 2013, 06:05 PM
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What did your TPS tests show?
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Old April 1st, 2013, 06:08 PM
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Quote:
Originally Posted by wantone View Post
thanks jason! i will give her a go at lunch time. you mean pull the big long connector off the ecu at the floor well correct?
Yep!
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old April 1st, 2013, 06:16 PM
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Hows the coil?
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Old April 1st, 2013, 06:19 PM
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haven't tested the tps yet. the coil doesn't appear to be leaking, and last fall i re-did all the connections so they are new and not corroded. could the old plug wires be doing this? if the tps tests good, no vacum leaks and cleaning the ECU connection and the wires dont change it, what next? the coil?
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Old April 1st, 2013, 06:45 PM
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Rovergauge
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Quote:
Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old April 1st, 2013, 07:18 PM
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where is a good place to get a Rover gauge?
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  #16  
Old April 1st, 2013, 07:26 PM
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Chicklet could be getting hot, coil, water in the ECU, new alternator shorting if you bought a cheapo bosch ...

Do you have any codes on the check engine light?
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Old April 1st, 2013, 08:24 PM
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http://www.defendersource.com/forum/...ght=rovergauge

this has the links .... it's not a magic bullet ... but it certainly puts some logic and process to troubleshooting.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old April 1st, 2013, 08:47 PM
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Whats the chicklet? When my old alt was bad the tach would go dead when it would cut out. This time it is not & it is more of a miss or sputter & not like the motor simply shuts off for a second like before. No check engine light or codes
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Old April 1st, 2013, 09:38 PM
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Does the readout show any codes at all?
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #20  
Old April 2nd, 2013, 10:45 AM
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jason, the tps checked out fine. i checked the code display and when i would start it i got a faint flash of what looked to be 00. i pulled off the ecu connector and hit it with cleaner and an air gun. next i pulled the ecu to check for water in it and it was dry. when i put the ecu back in and started the truck, i got a bright 02 read out. i hope this is a good sign. i will get to test drive later today....

how long does the reader stay lit when the truck is on?
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