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High idle , Down on power
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DRR Trophy
Picture of Bigdrive88
posted
Friend of mine started having a issue this past weekend. Car usually runs mid 4.90's. 2008 Stratus. Started it up sat for 1st time run & the idle was higher than normal. Almost like it had a lean condition. Car went 4.98. @nd Time run idle was higher yet & car ran 5.13. Racepak shows a loss of 200+ rpm throughout the run compared to runs made a couple weeks ago. 8 EGT's on the car they are all very close to runs made a couple weeks ago. Any ideas ?
 
Posts: 185 | Location: Hagerstown | Registered: September 01, 2014Reply With QuoteReport This Post
DRR Sportsman
Picture of novaX522
posted Hide Post
We had something similar happen this Summer. Found the intake gasket got sucked in. Replaced intake gaskets and it was back to normal.


Rob Livingston
 
Posts: 176 | Location: Waterloo, Iowa | Registered: July 03, 2005Reply With QuoteReport This Post
DRR S/Pro
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You sure throttle isn’t hanging up and not opening all the way or returning all the way?
 
Posts: 2591 | Location: at the track | Registered: May 09, 2007Reply With QuoteReport This Post
DRR Trophy
Picture of Bigdrive88
posted Hide Post
We checked it. Seems to be fluid in its movement.


quote:
Originally posted by green1:
You sure throttle isn’t hanging up and not opening all the way or returning all the way?
 
Posts: 185 | Location: Hagerstown | Registered: September 01, 2014Reply With QuoteReport This Post
DRR Trophy
posted Hide Post
Did you check valve lash? Sometimes they do that when losing a lifter.
 
Posts: 82 | Location: Salt Lake City | Registered: August 06, 2009Reply With QuoteReport This Post
DRR Pro
Picture of rusty
posted Hide Post
carb about to fall off tighten the bolts lol


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1421 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR S/Pro
posted Hide Post
Check the timing.
 
Posts: 2591 | Location: at the track | Registered: May 09, 2007Reply With QuoteReport This Post



DRR Sportsman
Picture of BD104X
posted Hide Post
quote:
Originally posted by novaX522:
We had something similar happen this Summer. Found the intake gasket got sucked in. Replaced intake gaskets and it was back to normal.

This...


Billy Duhs - BD104X@gmail.com
 
Posts: 635 | Location: New Jersey | Registered: February 26, 2000Reply With QuoteReport This Post
DRR Sportsman
posted Hide Post
When I drove a dragster for Rob, we had the same problem with intake gaskets. It would suck them in at the bottom of the ports. Idle would jump up and et would fall off.


Disclaimer: The opinions expressed here are the views of the writer and do not reflect the views or opinions of any entity other than myself.

72 Nova 370 ci (Stealth Black)
 
Posts: 394 | Location: Hanover, MD | Registered: July 22, 2003Reply With QuoteReport This Post
DRR Trophy
Picture of Bigdrive88
posted Hide Post
Thanks for all the opinions. Im sure the answer falls somewhere within these answers. Except for maybe the carb falling off. Laughing Hard
 
Posts: 185 | Location: Hagerstown | Registered: September 01, 2014Reply With QuoteReport This Post
DRR Pro
Picture of rusty
posted Hide Post
it is most likely a vacume leak and most likely the intake,the egts should tell the story providing the weather is taken into account,maybe one or two cyliners would be different and maybe only tenths.


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1421 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR Sportsman
posted Hide Post
The high idle sounds like a vacuum leak.

Earlier this season my terminator loosened up (like rusty said!) and I had a high idle because of the vacuum leak. It didn’t change the ET because at WOT the engine was still getting all the air it wanted and the fuel was the same because of the injection. A similar vacuum leak with a carb would likely make the car slow down because the air fuel ratio would be wrong.

If you have an intake gasket leak then there’s a vacuum leak to the pan. Does the racepak log pan vacuum? That might tell you if it’s an intake gasket leak.
 
Posts: 728 | Location: Upstate NY | Registered: July 02, 2013Reply With QuoteReport This Post
DRR Trophy
Picture of Bigdrive88
posted Hide Post
It does & it really should pull mote than it does. Only pulling about 6". They have adjusted the regulator for it but it didnt help.
 
Posts: 185 | Location: Hagerstown | Registered: September 01, 2014Reply With QuoteReport This Post
DRR Trophy
Picture of Bigdrive88
posted Hide Post
Got the intake pulled today & found 1 pushrod on the intake side was actually stuck down in the lifter. No lash. Gaskets he said were maybe an issue as well.
 
Posts: 185 | Location: Hagerstown | Registered: September 01, 2014Reply With QuoteReport This Post



DRR Sportsman
posted Hide Post
Looks like you got it fixed. Congrats on your win this weekend.


Disclaimer: The opinions expressed here are the views of the writer and do not reflect the views or opinions of any entity other than myself.

72 Nova 370 ci (Stealth Black)
 
Posts: 394 | Location: Hanover, MD | Registered: July 22, 2003Reply With QuoteReport This Post
DRR Pro
Picture of Goob
posted Hide Post
My vote was intake valve(s) leaking.
If the intake gasket sucks in, you'll have vacuum in the crankcase as mentioned.


"Despite the high cost of living, it remains popular."
Dave Cook
N375
 
Posts: 1704 | Location: Indy | Registered: November 21, 2008Reply With QuoteReport This Post
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