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rpm's out of control 

 

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 Post subject: rpm's out of control
Posted: Mon Oct 15, 2007 7:16 pm 
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hello i have a 1996 fairmont ghia and the rpm's are going wild i am going through fuel like theres no tommorrow so far i have had a full service, new leads, electric tune new welsh plugs put in it i have had my car to 2 different mechinics 4 times they can not find whats wrong with my car and now they say to take it to a auto electrician i am lost as to what to do


should i get the fuel injectors replaced or does anyone have any suggestions.... please help :( :? thanks jasmine
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Posted: Mon Oct 15, 2007 8:04 pm 
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what do you mean the rpms are going wild?
not trying to be rude but you need to make your questions as clear and detailed as posible,
theres plenty of members who know there stuff in the v8 forum that are happy to help..



-mitch

 

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Posted: Mon Oct 15, 2007 8:16 pm 
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you mean rough RPM or higher RPM ??? not clear
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Posted: Mon Oct 15, 2007 10:07 pm 
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How much fuel is it using, ie km's to a tank?
Is it just the tacho going wild or is the car surging
New welsh plugs on a 11 year old car :shock:
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Posted: Mon Oct 15, 2007 10:18 pm 
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get a dianostic and the computer may show codes and will prolly tell you ya isc or ips is rooted

 

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Posted: Wed Oct 17, 2007 6:04 pm 
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sorry everyone my first time using site ok my car is surging when it surges smoke pours out my exhust and i am going through fuel like i have gone through 50 bucks worth of fuel this week and i have done 288 ks i normally get 400 or more ks out of a full tank but im not i have had the computer checked all that it is saying is that i have had a flat battery at one stage nothing else is coming up
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Posted: Wed Oct 17, 2007 6:11 pm 
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smoke= stuffed rings IMO.

And thats about what you could expect out of a mpefi 5.0 k's wise if you thrash it around. 400 would be keeping rpm's under 3,ooo , and just basically nursing it.

 

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Posted: Wed Oct 17, 2007 6:22 pm 
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raff-26 wrote:
smoke= stuffed rings IMO.

And thats about what you could expect out of a mpefi 5.0 k's wise if you thrash it around. 400 would be keeping rpm's under 3,ooo , and just basically nursing it.
Black smoke generally equals rich, which funnily enough also seems to match up with the increased fuel consumption.
I don't think it's a coincidence.

The MPEFI 5Ls are not that much, if any, harder on petrol then the 4Ls.
I can get 450 out of mine easily, thats not babying it constantly either.
I've gotten 550+ out of it on the open road.

I'd be looking at something like a stuck injector?

 

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Posted: Wed Oct 17, 2007 6:29 pm 
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so would you suggest cleaning fuel injectors i use vortex fuel i do not put anything in it like injector cleaners or nothing cause i have been told not to is that correct
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Posted: Wed Oct 17, 2007 6:33 pm 
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A dirty injector won't generally be that extreme, if you can get a length of tube, and listen to each injector while it idles, if one or more isn't ticking = stuck.
Did the mechanics have any thoughts on it all, surely they would have checked s**t like this?

Could be faulty MAF too I guess, if you can get a known working one to test.
Pretty hard to diagnose something so vague over the internet.

 

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Posted: Wed Oct 17, 2007 6:36 pm 
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try getting the recoed injectors, i got new ones on my old eb and it had danoe just over 200k it made a huge difference, made easier starting better power and fuel economy
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