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Trey
Dodge Dakota
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10/21/2002
18:19:23
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 Subject: No more power
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Message:
I have a 1999 Dakota sport 4x4 5.2, KN FIPK, and FMS injectors. I get about 10.5 mpg, if a really baby it I might get up into the low 11 mpg range. It also seems like it just does not want to accelerate. when I first got the truck about a year ago it ran just fine and got much better gas milage. It idles just fine but it sound like it is pinging when I try to accelerate. what might be happening? is the engine leaning out? is the timing off? could it be a vacum leak? Could the timing chain be streched? Trans dieing? It also seams to not have as much power as when I got the truck about a year ago.
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Fubar512
GenIII
10/21/2002
18:24:55
|  RE: No more power
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Message:
It may be one of two probs, and possibly, both together!
The first possibilty is that you have a blown belly-pan (plenum) gasket in your intake manifold.
The second is that your truck's cat is plugged, and needs to be replaced.
It almost sounds as if you're suffering from both probs. Check the cat, first.
Confucious say: Any man can pee on wall. Be a true hero and crap on ceiling! I've tried being a hero once too often...
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Trey
Dodge Dakota
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10/21/2002
19:18:45
|  RE: No more power
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Message:
How do you check the cat? I cant just take it out and look at it.
As for the belly pan, how hard is it to replace? how long, what tools, what parts? There is a whistle at part throttle, and when I look through the TB I see that the pan does have oil on it. Should it be completely dry? or is a little bit normal?
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Fubar512
GenIII
10/21/2002
19:57:07
| RE: No more power
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Message:
There shouldn't be any oil in the Manifold at all.
Checking the cat is best done with a vacuum guage. Just hook up the guage, rev the engine slowly to about 4000 rpm, and see if the vacuum reading falls drastically at speed, which would indicate high back pressure.
Confucious say: Any man can pee on wall. Be a true hero and crap on ceiling! I've tried being a hero once too often...
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Trey
Dodge Dakota
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10/21/2002
23:19:07
| RE: No more power
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Message:
As soon as I find a vacuum guage I will try it out. I assume they can be found at the local auto parts store? If so, I will pick one up on my way home from work tomorrow.
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Trey
Dodge Dakota
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10/22/2002
23:34:01
| RE: No more power
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Message:
ok, I got the guage and saw the at idle I have 20 in Hg, at 1k 2k 3k rpm it is just a little higher. With idle-WOT-idle, it drops to zero and then up to 25 and the back to 20. Looks like it checks out. I am going to try it again when it is light out, and with my auto friend, he knows lots and uf really good at this stuff
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Fubar512
GenIII
10/23/2002
05:02:26
| RE: No more power
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Message:
That means you don't have an excess of exhuast back-pressure, so your Cat should be fine.
Confucious say: Any man can pee on wall. Be a true hero and crap on ceiling! I've tried being a hero once too often...
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Trey
Dodge Dakota
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10/26/2002
16:42:44
| RE: No more power
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Message:
OK, I got the oem injectors back in, I checked fuel preasure, its dead on and 45 psi throughout the rpm range, and the vaccum is dead on at just above 20 in/hg. through the rpm range. Letts see what happens to the power and milage now.
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mmm3
Dodge Dakota
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10/27/2002
11:03:46
| RE: No more power
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Message:
my dak will only do 3800 rpm flat out, do i do this test at 3000 rpm. ?
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Trey
Dodge Dakota
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10/27/2002
12:29:03
| RE: No more power
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Message:
what do you mean "3800 rpm flat out"? Is that as high as it will rev under WOT?My truck has a redline or 4700 rpm but it will rev to 5k if I let it. If your redline is 3800, I would think testing it to 3k would give you a good idea of what is going on in your engine.
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Trey
Dodge Dakota
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10/29/2002
12:31:19
| RE: No more power
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Message:
OK, I took the tire preasure up another ten psi and put in the oem injectors and gas milage improved about half a mile per gallon. I dont know what is left. Im thinging its about time to trade it in for a toyota tacoma. Lighter, smaller better MPG, and if I get the super on it, then its more HP than I have now!
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