My 86 shelby charger has about 6000 km's on its new rebuild.
Car is a 2.2 fully converted to TII, new mahle cast pistons, moly rings fully rebuilt block, new slider cam and rebuild head etc.
At idle my vacuum is around 11.... I have also noticed the PCV valve is making a ton of noise at idle (I have tried two brand new valves one mopar and another part store brand.)
What should I be checking? Car pulls very hard still, not using oil, and was broken in with regular oil.
vacuum leak or timing is off...probably vacuum leak
-Jim Too many cars, not enough time..
whats it at around 3k rpm?
HOOSIER SDAC vice pres. 1993 IROC R/T 1 of 90 emerald green 1985 DC SHELBY CHARGER 1985 DC TURBO Z DAYTONA
It must be a leak in the line to the gauge, a bad gauge, or your cam timing must be way off.
+infinity or you've got one hell of a lumpy cam,Originally Posted by cordes
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS!12.57@104 :O)
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
Thanks guys, I'm going to try out another guage today.
Incorrect idle speed,- reset throttle stop screw.
Incorrect ignition timing, -reset to 12* with coolant sensor unplugged.
Restricted exhaust, -only if the power is low as well.
Restricted inlet, - filthy air filter or kinked inlet/charge pipes.
Incorrect cam timing,- reset to spec, or possibly a missmatch in slider cam/cam sproket.
Low valve lift due to worn cam lobes.
Worn or broken valve springs.
Worn or broken lifters.
That's about all I can thing of that could cause low vacuum. Listed in order of most likely at the top.
Checked for vacuum leaks couldn't find any, the car still chugs/surges a bit at idle
We did a compression test and got 118psi across all 4 cylinders. Cylinder 3 was slightly less (about 115)
I pulled the valve cover and the cam looks ok as well.
There always has been some smoke coming from somewhere underneath the intake...
Spray some carb spray or starting fluid ( use the little straw that comes with them for pinpoint accuracy, and to minimize any fire hazard others are sure to say are imminent) around the injectors where they go into the intake, sometimes those o-rings go bad and leak air. Is it throwing any codes? Does it run rich? The compression numbers are decent. What intake do you have?
TII Two piece intake, TII intercooler. Now the car has a turbo xs bov, i'm wondering if its leaking...Spray some carb spray or starting fluid ( use the little straw that comes with them for pinpoint accuracy, and to minimize any fire hazard others are sure to say are imminent
I'm going to see if I can tighten up the intake manifold bolts too
The BOV won't make any difference in vacuum, as it is in front of the TB. Check the TB gasket, my 2-piece had the bottom hole stripped and let it leak behind the TB. Helicoiled it and all was good. The manifold-to-head gasket rarely ever leaks.
Compression seems low to me, cam timing is probally off.
Ill prob try to check the cam timing tommorow, and poke around again to try to find some leaks.
I did try another vacuum gauge and they are both reading the same.
Steve, do you remember what cam and cam gear you used? Is that a 782 head or g-head?
Robert Mclellan
http://www.youtube.com/watch?v=wambNdfnu5M
10.04 @ 143.28mph (144.82 highest mph)
Worlds fastest 8v MTX Shelby Charger
Manitoba's Fastest 4cyl!
8 valve, No Nitrous!
New clutch combo is the SH!T!
Its an 86 782 swirl head (from my 86 Turbo Z), its a slider cam that was apparently new(got the head done at Joe's Machine shop in the city many many years ago) And its the original slider cam gear.
I like to see 17-18 inches of vacuum at hot idle. I wonder about your 2 piece intake leaking?
Do the easy stuff 1st, check ignition timing and cam timing. If that doesn't solve it, start looking at the other stuff.
1986 Chrysler Lebaron 2 dr. R.I.P. 2.2 T1 log intake, modified to intercool Best 1/8th 9.03@77mph / Best 1/4 14.16@93.55mph Running on E85:nod:[SIGPIC][/SIGPIC] '93 Spirit 2.5 TBI 5 Spd(sold), '85 Ramcharger, 360 4brl, NP435 4 Spd. The new ride; '90 Sundance 2.5 T1/5 spd. FMIC(from Ford Probe) new Mitsu; Best 1/8th 8.96@79.16 / Best 1/4 14.06@101.27
Then your compression is deff a little low.
Robert Mclellan
http://www.youtube.com/watch?v=wambNdfnu5M
10.04 @ 143.28mph (144.82 highest mph)
Worlds fastest 8v MTX Shelby Charger
Manitoba's Fastest 4cyl!
8 valve, No Nitrous!
New clutch combo is the SH!T!
Compression is a bit low but not enough for 11" at idle.
If the cam is unknown, could be a weird grind but obviously check basics first.
1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS!
1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
2004 GSW TDI, 5 speed, fully loaded, modified.
Aurora ignition wires for sale. Link to info
Super60 roller cams or custom/billet cams. Link to info
Is your new slider cam stock or performance grind????
It was "supposed to be a new stock slider cam"
I was thinking of re-checking the timing tonight.
Would an 89 roller cam work on this engine? (or would I have to switch all the pulleys over to the 89 round tooth style?)
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