'97 no power upon acceleration, backfire at intake - Defender Source
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  #1  
Old May 11th, 2015, 12:33 PM
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mike hall
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'97 no power upon acceleration, backfire at intake

truck starts and idles ok, no code. replaced fuel pump, fuel filter & stepper. replaced o2 sensors a few days prior to the problem, put the old ones back in, no change. engine dies if you attempt to rev it to fast. loses power, backfire at intake if you slowly accelerate. heading out on vacation tomorrow and sure would like to be able to drive it, so any help is appreciated. oh yeah,~165000 miles on the truck. thanks,
Mike
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  #2  
Old May 11th, 2015, 12:38 PM
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Jason England
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Air leak!

I'd start with the big hose.
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  #3  
Old May 11th, 2015, 12:42 PM
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Virgil Broussard
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I know it sounds stupid, but did you disconnect the battery? When I have stalling issues with mine, I disconnect the battery for about five minutes and all seems well.
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  #4  
Old May 11th, 2015, 01:12 PM
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mike hall
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just checked the hoses and disconnected the battery for a few minutes. hoses appear to be fine, I changed all the small ones about 6 months ago. anyway, no improvement. thanks for the quick reply.
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Old May 11th, 2015, 01:19 PM
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Have you got spark at each cylinder?

The other think could be timing ... they have a crank position sensor on a 97 ... is that OK?
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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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  #6  
Old May 11th, 2015, 01:26 PM
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mike hall
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haven't checked the CPS, gonna have to find it first. just weird to me that it idles fine and cranks right up. 'course, i'm no mechanic but I can take instruction pretty well. thanks again
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Old May 11th, 2015, 01:34 PM
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Jason England
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Also could be a vacuum advance issue ... I'm less familiar with the 97 ... but if it wasn't advancing that could cause the problem.

To be honest there are lots of things ... I often find I've dislodged something when working on the truck. Retrace what youve been working on and see if that helps.
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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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  #8  
Old May 11th, 2015, 04:47 PM
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Keith Armstrong
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Quote:
Originally Posted by bamanuke View Post
haven't checked the CPS, gonna have to find it first. just weird to me that it idles fine and cranks right up. 'course, i'm no mechanic but I can take instruction pretty well. thanks again
CPS is on the opposite side of the starter. Drivers side, low on the front of the "bellhousing" area...it's poking in toward the forward face of the flex plate.

But unless it's wibblling around in there loose, I doubt that's your problem.

Check the mechanical bits first...fuel / vacuum / wires & hoses...before hunting electronic gremlins.

...wtf do I know...I'm just the accountant here
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  #9  
Old May 11th, 2015, 06:27 PM
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mike hall
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thanks Keith, looks like it will be the weekend before I can get back to it. first time it hasn't been on vacation with me since I bought it. appreciate the feedback.
Mike
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  #10  
Old May 11th, 2015, 09:25 PM
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Not the cps, if it were you wouldn't be able to start it.

Check the usual, fuel, air filter, wires, plugs first.
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  #11  
Old May 11th, 2015, 10:06 PM
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Chris
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Assuming fuel pump is ok, did you fill up just before this started? Thinking bad fuel
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  #12  
Old May 11th, 2015, 10:18 PM
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Tyler Wirken
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Make sure to check the Main intake hose coming from the Mass air flow sensor to the plenum. Mine looked fine until I checked the bottom side of the hose and it was totally rotted out and full of holes. It would run fine in the city but as soon as I hit highway speeds up around 3,000 RPM it would cut out.

Just a thought.
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  #13  
Old May 11th, 2015, 11:03 PM
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Quote:
Originally Posted by Tyler Wirken View Post
Make sure to check the Main intake hose coming from the Mass air flow sensor to the plenum. Mine looked fine until I checked the bottom side of the hose and it was totally rotted out and full of holes. It would run fine in the city but as soon as I hit highway speeds up around 3,000 RPM it would cut out. Just a thought.
x2 on this.
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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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  #14  
Old May 12th, 2015, 12:15 AM
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James Wallace
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Since the 97 has the OBD II system, go by AutoZone (they have a loner tool program) or the like and borrow a code reader. The receptacle to plug it in is in front of the shifter, you lift out the small well there and it is under that next to the fuses. Running like it is may give you some codes to help pinpoint what is wrong. It may not throw it up immediately, but should after a couple of minute pop up with a code on the reader. Lots of codes will not illuminate the check engine light.

Does it smell, like unburnt mixture?
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  #15  
Old May 12th, 2015, 06:42 AM
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mike hall
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I have a code reader. no code showing. new fuel put in when I replaced the fuel pump, 93 octane non ethanol. problem started on my way home from work, just started running rough and lost power. originally changed the fuel filter and when that didn't work, checked fuel pressure, which was a little low at 36 psi, so I replaced the PITA fuel pump. still no change. hose from the MAS looks fine, but i'll go ahead and remove/check it. thanks guys
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  #16  
Old May 12th, 2015, 08:22 AM
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Matthew Scanlon
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It sounds like the timing is off
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  #17  
Old May 12th, 2015, 08:23 AM
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Quote:
Originally Posted by Matt223081 View Post
It sounds like the timing is off
yeah but that is very unlikely to happen just driving along ...
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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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  #18  
Old July 20th, 2015, 08:09 PM
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mike hall
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looks like I need an ECU or a shop that can repair mine. my local "European" repair shop determined that the ECU wasn't sending an input to a couple of the coils. He shipped the unit to a repair shop up north and they were not able to source replacement parts. been dead in the water for over two months now, so any/all help is really appreciated.


Mike Hall
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  #19  
Old July 20th, 2015, 09:27 PM
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Jason England
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Quote:
Originally Posted by bamanuke View Post
looks like I need an ECU or a shop that can repair mine. my local "European" repair shop determined that the ECU wasn't sending an input to a couple of the coils. He shipped the unit to a repair shop up north and they were not able to source replacement parts. been dead in the water for over two months now, so any/all help is really appreciated. Mike Hall
Just buy another ECU. They probably stuck them in discos. No doubt someone who knows will chime in.
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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 July 20th, 2015, 09:36 PM
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mike hall
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thanks Jason, pulling my hair out trying to figure out what will work. may just have to have the truck shipped to someone that's a little more Rover savvy than my local guy.
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