Fuel or ignition? - Defender Source
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  #1  
Old January 7th, 2011, 11:44 PM
jhhorse
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joe heins
1995 defender 90
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Fuel or ignition?

Help please!
I have searched the forum and cannot find this exact issue, so thought I would ask: 95 D-90 with 3.9, after driving for a bit, highway or around town, engine warmed up for a long time, after I turn the engine off for more than 5 minutes, when I start it back up, it idles ok, but stumbles a bit when trying to accelerate in first gear. once I get it going, it runs fine.
In addition, around 3200 rpm when accelerating any gear, it seems to reach a peak and will not accelerate any more.
It seems to me I have a fuel issue? Any help please. Thanks
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  #2  
Old January 8th, 2011, 10:27 AM
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Bill Adams
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Well, Joe, it starts and runs so it's probably not fuel (assume new fuel filter). The next thing you have to look at is the spark. How long ago did you replace the cap,rotor, wires and plugs? Is the timing spot on? If you can answer recently and yes, then the issues may be connectors, sensors or dirt. Is the T-Piece clean?
Lots of stuff to check first before moving on.
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Old January 8th, 2011, 11:12 AM
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Mike Deery
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If it is carburated, does it "stumble", as you mention, when you accelerate rapidly? Could be fuel starved. If dual carbed, could be a sync issue, float sticking, dirt, worn needle, air leaking into system, etc. I wouldn't expect a spark issue if it fires fine at idle. Might be a problem with the advance on the distrubutor if it happens at a certain RPM in each gear.
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Old January 8th, 2011, 12:39 PM
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Bill Adams
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Mike, I assume he's referring to the '95 model in his ID blurb. No carb there, just good old fashioned EFI. I suspect (in no particular order): ignition amplifier, cap and rotor, dirty t-piece, crappy gas, clogged fuel filter, dodgy fuel pump, low battery, bad ground, TPS, ACT sensor, fuel pressure regulator, air filter....
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1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

All my troubles are Rover
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  #5  
Old January 8th, 2011, 02:05 PM
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Verticalscrote
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Quote:
Originally Posted by o2batsea
Mike, I assume he's referring to the '95 model in his ID blurb. No carb there, just good old fashioned EFI. I suspect (in no particular order): ignition amplifier, cap and rotor, dirty t-piece, crappy gas, clogged fuel filter, dodgy fuel pump, low battery, bad ground, TPS, ACT sensor, fuel pressure regulator, air filter....
Timing, clogged cats, O2 sensors...
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  #6  
Old January 8th, 2011, 03:26 PM
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Mike Deery
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Bill-
You are right... I confused my engines / year as I am always (almost always) dealing with older ROW Rovers personally.
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  #7  
Old January 9th, 2011, 06:30 PM
jhhorse
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joe heins
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Quote:
Originally Posted by o2batsea View Post
Well, Joe, it starts and runs so it's probably not fuel (assume new fuel filter). The next thing you have to look at is the spark. How long ago did you replace the cap,rotor, wires and plugs? Is the timing spot on? If you can answer recently and yes, then the issues may be connectors, sensors or dirt. Is the T-Piece clean?
Lots of stuff to check first before moving on.
Thanks, That is where I will start. Plugs and wires fairly new, just changed fuel filter (cause its easy) and that improved it a little. Will change cap and rotor, check timing and let you know. Thanks
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Old January 9th, 2011, 09:10 PM
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Scott Y
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Sounds like an issue I had a couple years ago. Is the ECU throwing any codes? Eventually I changed the TPS and never had the issue again. "Knock on Wood" BTW, when the TPS finally gave up, it would only idle. Of course, I believe this is dependent in how the TPS is failing -- heard they develop "dead zones" in the poteniometer windings.
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  #9  
Old January 16th, 2011, 05:21 PM
jhhorse
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joe heins
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Fuel filter did it.

After changing the fuel filter and driving for a week, it appears these problems are gone!
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