Power loss and popping!

[TwisteD90]

I searched but did not find any info regarding my problem so here it is. I’m experiencing a power loss and I can not rev the engine past 3400-3600 RPM and when I hit that mark the engine starts to make popping noise. No check engine light and no codes. It also ideals a little low sometimes at 400-600 rpm and when I try to rev the engine up the rpm don't want to go up and it also makes that popping noise. Ideas?

Thanks,

[wicks]

Hard to tell, but the popping noise is most likely a misfire. ? Electrical/ignition problem perhaps. Can't tell what year you've got - could be the old distributor come loose issue if it's an older one.

[dnewman9]

Yousef,
I borrowed my dad's Discovery a few months ago and it started to do the same thing and slowly ended up not running. It ended up being that the fuel pump slowley crapped out and died.

Given the fact you were talking about yours making odd noises you may want to give it a check.

Dennis

[TwisteD90]

It's a 95. I'd rather have something that came loose than replacing a part at the moment.

[TwisteD90]

Yousef,
I borrowed my dad's Discovery a few months ago and it started to do the same thing and slowly ended up not running. It ended up being that the fuel pump slowley crapped out and died.

Given the fact you were talking about yours making odd noises you may want to give it a check.

Dennis

I hope not. It's a new fuel pump with less than 50 miles.

If that's the case I'm defiantly buying a new LR fuel pump assembly rather than the ghetto Caddi pump :mad

[Bowtracer]

I hate to ask a silly question but did you check the plug wires??!

[Mike Hippert]

Reset the ECU if it hasn't thrown a code yet! It should have. Mine did the same thing after I ran Seafoam through it, after I reset the engine it ran better then ever. If not start by checking the simple things first.

[TwisteD90]

Peter, actually that is not a bad idea. I will do it tomorrow.

Mike, how do you reset the ECU? Discounting the battery?

Now could this be the problem. I heard that when you replace the fuel pump, the fuel filter should be replaced at the same time. Do you guys think that's why causing the power loss?

[Mike Hippert]

Any thing is possible

[Mike Hippert]

Sorry hit the button too fast. dissconnecting the battery for a few minutes is the easyest way to reset.

[jorge]

I had the same problem,it turned out to be a spark plug wire was arching against the manifold.Check your wires for a white powdery mark,that's where I had the break in the wire .Changed wire and all was fine.Since then I always carry a used spare set just incase.

[TwisteD90]

Thanks Jorge, i will do that.

[Davis]

Yousef--It could very well be a bad zeener diode in your alternator. That is the symtoms with mine (except a distinct popping sound). If the other solutions don't pan out, check that. Tim at Simcor in Boulder re did mine with great sucess. (upon re-reading my post, I realize that my problem occured at around 2600 rpm. That said, I thought I would leave this intact in case it is still the alternator)

[TwisteD90]

I put a new Fuel filter, removed air filter just incase its dirty and restricting air, and made sure all the plugs are ok and it still doing the same thing. If I press the paddle slowly I can rev the engine up to 3600rpm but if I do it quick it won't rev, Boggs down, and loud popping from the air filter box.

Still no codes and I also discounted the battery for 15 minutes.

Any other ideas?

[Mike Hippert]

Can you check the fuel pressure? Seems like your not getting enough fuel. Turn the ignition to on and listen to the fuel pump, how long does it stay on and how’s it sound?

[TwisteD90]

I don't have a fuel pressure gage at tje moment. the fuel pump sounds healthy to me.

[souza]

I had one of my catalytic converters replaced a year or so ago, and upon picking up the truck it ran just like that. No power, misfiring like crazy, choppy low idle, etc. Eventually, after driving home about 5-6 miles (I had to get it home!) it did throw a code. It was the 02 senser on the side the cat was replaced, the guy had fried it with his welding torch. I couldn't believe how badly one 02 sensor made the truck run. Kind of a long shot, but the symptoms are the same ('cept the check engine). You could always unplug one or both of your 02 sensors to test it (which should throw a code).

[Mike Hippert]

Yousef, you said 50 miles on the new pump right? I think your pump is clogged. I bet something small got in it and clogged it up. A coworker just said to pull the fuel line off the filter and stick it in the gas can, then have someone turn the key to on for a second, gas should shoot right out the end of the line, so be careful.

[TwisteD90]

Dave thanks for tip. I think I'll have Jeff check it out for me. I'm going crazy here.

Mike, actually after thinking about it my pump doesn't even have 15 miles on it. Now what is the purpose of pulling the fuel line? Is it to check if I have enough pressure, if so how am I suppose to determine that. It will shoot fuel either way right?

[Mike Hippert]

If you have good pressure it should shoot out pretty hard, if it's working poorly it will trickel out slow, if it's not working nothing will come out. I would think to be causing the problems you are seeing that it would not come out that hard. I think the required pressure is 30 or 40 lbs.

[Doug]

41 lbs.

[Buckon37s]

The best way to check fuel pressure is to pull the line and stare down the hose as you turn on the engine :rofl JK, sounds like the best fix is a TDi. :)

[TwisteD90]

:lol

Thanks for the replies guys. I'll work on that let you know what happens.

[BarryO]

Can you check the fuel pressure? Seems like your not getting enough fuel. Turn the ignition to on and listen to the fuel pump, how long does it stay on and how’s it sound?

So how long should it stay on when you turn the ignition on?

[Mike Hippert]

Normally a couple seconds.

[Bowtracer]

BAD CAM! lobes might be warn. Does it pop though the intake!

[TwisteD90]

Really? that's not good. Yes it does pop through the intake.

I'm gonna buy a fuel pressure gage tomorrow and see if this is the problem first.

[Bowtracer]

DO a compression test/ leak down test!

[TwisteD90]

Ok, I will do that if the fuel pressure is fine.

Thanks,

P.S. Where can I get the tool to test the compression?

[DJ Menasco]

Hmm, there's a lot of good advice provided here but it sounds like your extrapolator is wearing out. It happens when your Defender doesn't get enough panties and/or thongs hitting the windshield. To fix it you need to drive alone & quickly to Fort Lauderdale. Now, be careful that you don't run into the "Girls-Gone-Wild" film crew because that might result in panty overload and your D90 might perform too well and blow a head. Just peruse around town for a while until the D90 is in tip-top-shape and you can head back! :)

Seriously, If it's backfiring through the intake especially when you accelerate then chances are you need a new cam shaft Yousef.

DJ

[dnewman9]

Can you check the fuel pressure? Seems like your not getting enough fuel. Turn the ignition to on and listen to the fuel pump, how long does it stay on and how’s it sound?

I agree that is exactly what my dads disco did when the fuel pump went out.
Dennis

Also, the exhaust got red hot as it was running VERY lean. Be carefull how long/hard you drive it untill you get it figured out.

[Bowtracer]

A cam is not the end of the world! Think of all the fun you will have when you put a hot cam & a remap of your ecu! I know it is big bucks but better in your driveway that on some remote rock someplace. GOOD LUCK!
Peter

[Shane@EVS]

I would check the timming, sounds retarded:D

[mhansen]

Kinda sounds like a timming issue. Is your distributer loose? Also pull the dist. cap and see if anything looks funky, like carbon or metal flakes etc.

You just may have to go see your girlfriend Linda :eek:

[BarryO]

Normally a couple seconds.

Hmmm, mine takes 10-15 seconds. Does that mean it's going south? These don't look fun to replace (97's don't have an access hatch in the floor).

[Mike Hippert]

Well, I'll listen to mine when I start it and I thought it was faster but I may be wrong.

[TwisteD90]

Hmmm, mine takes 10-15 seconds. Does that mean it's going south? These don't look fun to replace (97's don't have an access hatch in the floor).

You can always make your own. I cut my tub last time and covered the whole with aluminum plate. If my problem is the fuel pump all I have to do is remove the rear seat and carpet and I'm in business :)

[TwisteD90]

I agree that is exactly what my dads disco did when the fuel pump went out.
Dennis

Also, the exhaust got red hot as it was running VERY lean. Be carefull how long/hard you drive it untill you get it figured out.

That's exactly what my D90 did. I opened the hood and dang, that think was HOT. Let's hope it's the pump since I have a spare one in my garage.

[TwisteD90]

IT'S ALIIVEEEEE! The problem was the sender hose in the fuel pump assembly. It was loose and couldn't build enough pressure. Went to pepboyz got 5/16" hose, clamps ($4). Put it together and the truck started right up, even faster than when it had the factory fuel pump. I am one happy person. Now need to start tackling the other problems.

Thanks for the help guys :)

[DJ Menasco]

Lucky SOB! A $4 fix! That's got to be some kind of record Yousef! Good to know that it wasn't a cam though!

[Mike Hippert]

:thumbs That was too easy sounding, go out wheeling and don't come back until you break something more worthwhile!