Loss of Horsepower - Defender Source
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  #1  
Old February 24th, 2005, 02:28 PM
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Brian Ellis
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Loss of Horsepower

Has anybody experienced this:
('95 D-90 SW, 87,600 miles)
I feel good low end power, decent acceleration in and around town, etc. But at highway speeds, especially going up hills, having a bleed off of horsepower? I pass semis on downhill segments, but they catch up to me on the succeeding uphills. These are while I'm in 5th gear, 60-70 mph.
At first it felt like my clutch slipping, but lately I'm wondering about a clogged cat. or exhaust obstruction someplace. The exhaust components all appear original.

Any help?

Thank you
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  #2  
Old February 24th, 2005, 02:43 PM
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There are some things that start wearing out at that point. I am only 2,000 miles behind you, and just did new head gaskets and a timing chain. While I had it apart, I also did a new cam and lifters.

The Cat may be clogging, and the muffler doing the same. I've heard that the factory cats sometimes start shedding chunks into the muffler.

-Hans
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  #3  
Old February 24th, 2005, 02:54 PM
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A d-90 with no horsepower....What the hell is going on around here.....

Nah, Just messing around....To me it sounds like you have an obstruction somewhere. Check your exhaust system thoroughly to see if there are any problems that you can tell. If not there you need to work your way up to the motor and look at the things that Hans pointed out and see about the condition of them.
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  #4  
Old February 24th, 2005, 03:14 PM
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You will know when your cats go! Sounds like rocks in a tin can any time you punch it. And parts will fly out and all will be good ask me how I know, I think both my cats are now empty. As other say, check airflow, out and IN, maybe the air filter is blocked up.
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Old February 24th, 2005, 03:47 PM
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Mike,
Just curious,
How did you come to be the D90 Source Slut.....Sounds like a pretty cool job
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Old February 24th, 2005, 04:34 PM
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LOL, Yousef gave me the title, apparently I have been in a lot of other peoples 90s or i should say I get around in the rover world.
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Old February 24th, 2005, 04:37 PM
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LMAO.....thats awesome
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  #8  
Old February 25th, 2005, 05:23 PM
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There are lots of potential reasons for lack of horsepower besides a clogged exhaust. Some things to consider: new fuel filter, new air filter, tune-up, clean fuel injectors and/or other intake parts. At higher rpms the engine will not perform if something is constricted.

After considering items of routine maintenance, then start thinking through parts with a limited life span. A bad o2 sensor will rob horsepower, though you shoud get an indicator light on that one.

I've dealt with this on numerous occassions. It has generally been cured with some element of routine work.
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Old February 26th, 2005, 10:07 AM
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After this weekend, I will have new exhaust manifold gaskets (one was leaking, so I'm replacing both sides; all 4 new belts and 8 new plugs (they appeared way blackened, like I was running rich). I will then attempt to haul ass up and down the highway to compare the performance difference, if any. These areas were in need of attention, anyway.

If my rig is still dragging at higher rpms I'll focus on the above suggested areas. Thanks for all the great ideas folks! (still learning). I'll advise my progress.

Brian
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Old February 12th, 2008, 10:32 PM
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Whats the verdict on the fix?

I am in the same boat with 80k miles. I went to the mountains yesterday and had some issues going uphill. Overall the truck runs strong but this was a new thing, granted I have only had the truck a few months so it may not be all that new. The PO was always good about service and took care of the truck.

I am curious to see what has resolved this. I am going to put a stock air filter in tomorrow and add some fuel injector cleaner (any thoughts on what to use?) and see if that helps. I just had new belts put on and changed the oil lines to SS (Ken Loy is the bomb!)

I'm not too mechanically inclined so I am hoping to keep it simple. I was thinking if either of my above ideas didn't work I was going to change the fuel filter. After that I am out things in my realm.
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