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10mpg and idle of 1,200..any ideas guys

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Old Mar 10, 2015 | 02:40 AM
  #1  
fenderman93's Avatar
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10mpg and idle of 1,200..any ideas guys

Hey guys this is sort of repost with more info, I still haven't fixed the problem hopefully you all can maybe find an answer for me...appreciate any help thank you!
The only thing left that i didnt do is the ECM scan and my fuel injectors, am i forgetting anything else i should check?
I have ordered the scan tool and should have it in 2 days and will post results!! Open to anything guys, im a college student and i really don't like 10mpg haha

Problem
-10 mpg and low overall power
-idles at 1,500 or slightly below cold
-operating temp idle is 1,200 P and 1,000 D


Specs
-1986 2.8 v6 mpfi
-timing at 6*
-idle air screw set correctly
-fuel pressure regulator new
-compression check is good
-new IAC valve (set correctly), EGR, O2 sensor, vacuum hoses,starter, cap/rotor, plugs/wires
-TPS (checked .54 V)
-PCV valve operational


Last edited by fenderman93; Mar 10, 2015 at 05:55 AM.
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Old Mar 10, 2015 | 03:24 AM
  #2  
Ron U.S.M.C.'s Avatar
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From: Northern, CA
Car: 1989 Iroc-Z Camaro
Engine: TBI,5.0
Transmission: Automatic 700R4
Axle/Gears: Eaton Posi,3.42,LPW Ultimate Cover
Re: 10mpg and idle of 1,200..any ideas guys

Specks on what ?




Last edited by Ron U.S.M.C.; Mar 10, 2015 at 03:49 AM.
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Old Mar 10, 2015 | 04:40 AM
  #3  
Tuned Performance's Avatar
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Car: 1967 Camaro, 91 z28
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Re: 10mpg and idle of 1,200..any ideas guys

Start checking for vacuum leaks, plenum, behind the throttlebody , intake manifold. Propane enrichment a unlit hand held torch or starting fluid.
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Old Mar 10, 2015 | 06:00 AM
  #4  
fenderman93's Avatar
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Re: 10mpg and idle of 1,200..any ideas guys

Tuned Performance yea thats what i thought too and thus combed that car up and down for two weeks replacing hoses and using all the different tricks to look for leaks.. nothing, no changes. I even got a second pair of eyes and nothing either. Although, that's a common cause of high idling..i dont think that's my issue here, seems to lean towards something else..but thank you though....any other ideas I'm all ears?

Ron U.S.M.C
"Specs
-1986 2.8 v6 mpfi"

1986 CAMARO.....
To be clear those are the specs of the car as well as adjustments and repair/replacements ive done...cmon, your killing me here
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Old Mar 10, 2015 | 06:17 PM
  #5  
ex-x-fire's Avatar
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Re: 10mpg and idle of 1,200..any ideas guys

Ohm the coolant temp sensor when it's warmed up. Should be close to 200 ohms.
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