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Silverbacks MM
- Thread starter Zack
- Start date
I continued the search for the high idle...no luck.
TPS is ramping voltage fine.
Switched the IAC...no change.
Sprayed the hell out of everything with carb cleaner, no change in rpm.
Removed all vacuum lines to rule out components...no change.
Disconnected the IAC....idle went down.
Im going to keep lowering the IAC duty cycle and see if that fixes it.
Since this car has no Intercooler and a recirculating bypass valve, im wondering if it can relieve excess pressure good enough to keep the idle in check???????
TPS is ramping voltage fine.
Switched the IAC...no change.
Sprayed the hell out of everything with carb cleaner, no change in rpm.
Removed all vacuum lines to rule out components...no change.
Disconnected the IAC....idle went down.
Im going to keep lowering the IAC duty cycle and see if that fixes it.
Since this car has no Intercooler and a recirculating bypass valve, im wondering if it can relieve excess pressure good enough to keep the idle in check???????
Zack;
In a previous post you mentioned that Silverback had 6.5 degrees of timing at 6K.
I asked if that was good or bad. But you were probably involved and didn't answer.
So....is 6.5 degrees advance at 6K good or too conservative?
Don't worry about the idle, it's consuming a lot of your time. However, if you would bring the IAC tables in the tune back to nominal values then when the high idle condition is corrected the tune won't be out of wacky. Make sense?
Bearing on the vacuum/idle situation. I now remember a few weeks prior to Louisville when I was chasing down the vacuum leak I remember finding a pinched vacuum hose (plastic) behind the glove compartment. It seems a pair of sunglasses was inadvertently pushed over the edge of the back panel in the glove compartment and found it's way between the little vacuum line and a hard place. I freed the line up but couldn't tell if it was "holed". The big leak behind the gage prolly would have hidden the small leak if in fact there is one. FWIW.
What did you discover with the wacky wipers?
Thanks for your attention to my car.
Pat
In a previous post you mentioned that Silverback had 6.5 degrees of timing at 6K.
I asked if that was good or bad. But you were probably involved and didn't answer.
So....is 6.5 degrees advance at 6K good or too conservative?
Don't worry about the idle, it's consuming a lot of your time. However, if you would bring the IAC tables in the tune back to nominal values then when the high idle condition is corrected the tune won't be out of wacky. Make sense?
Bearing on the vacuum/idle situation. I now remember a few weeks prior to Louisville when I was chasing down the vacuum leak I remember finding a pinched vacuum hose (plastic) behind the glove compartment. It seems a pair of sunglasses was inadvertently pushed over the edge of the back panel in the glove compartment and found it's way between the little vacuum line and a hard place. I freed the line up but couldn't tell if it was "holed". The big leak behind the gage prolly would have hidden the small leak if in fact there is one. FWIW.
What did you discover with the wacky wipers?
Thanks for your attention to my car.
Pat
Thanks for this info.
6.5 degrees of timing isnt squat. Cars with an intercooler have 14. Each degree of timing can equate to 10rwhp.
Havent looked at the wipers yet.
No its where it should be (based off TPS voltage) If the TB blades adjustment are tampered with you cant get the TPS in range without modifying the screws.
I drove it to work today with the ISC transfer function modified and it idles lower and coasts to a stop without the feel of it wanting to keep going.
Still have the wacky wipers, even after I took the connector off, cleaned it and put some dielectric grease on it. I unplugged the fuse....not sure if i will have time to address this problem.
Traveling to St. Louis tomorrow to pick up Silverback.
Zack has repaired and tested Silveback and he's ready to come home.
Thanks Zack for your welcomed help, the willingness to take on this task and your expertise and quality workmanship.
Summary of work:
Repaired broken vacuum hose behind boost gage.
Valve Job both heads to fix reported ticking. Shop found valve seals worn out.
Inspection of internal engine parts - all OK
Powder coated valve covers.
Replaced leaky power steering hose and oil filter adapter gasket.
Replaced drive belt.
Retuned tranny/converter to fix bucking. Found upshift and downshift points overlapping.
Added head cooling mod and fuel filter mod.
Cleaned MAF, Throttle body and idle air controller.
Regards,
Pat
Zack has repaired and tested Silveback and he's ready to come home.
Thanks Zack for your welcomed help, the willingness to take on this task and your expertise and quality workmanship.
Summary of work:
Repaired broken vacuum hose behind boost gage.
Valve Job both heads to fix reported ticking. Shop found valve seals worn out.
Inspection of internal engine parts - all OK
Powder coated valve covers.
Replaced leaky power steering hose and oil filter adapter gasket.
Replaced drive belt.
Retuned tranny/converter to fix bucking. Found upshift and downshift points overlapping.
Added head cooling mod and fuel filter mod.
Cleaned MAF, Throttle body and idle air controller.
Regards,
Pat
Yep its all good except the wacky wipers.
I got the idle down to about 800 in drive and it no longer goes 40mph with your foot off the gas.
I searched high and low for a vacuum leak and there definitely isnt one unless the bottom of the lower intake is cracked. but...17-20 in of vacuum depending on the circumstance tells me there is none. Short term fuel trims are also good.
Im going to miss the great stereo in this car!
And...I really think the car needs an intercooler. IAT's were 140 on an 80 degree day just driving around normally.
I got the idle down to about 800 in drive and it no longer goes 40mph with your foot off the gas.
I searched high and low for a vacuum leak and there definitely isnt one unless the bottom of the lower intake is cracked. but...17-20 in of vacuum depending on the circumstance tells me there is none. Short term fuel trims are also good.
Im going to miss the great stereo in this car!
And...I really think the car needs an intercooler. IAT's were 140 on an 80 degree day just driving around normally.
Happy as a MM owner can be........
+1, car made a 670 mile trip home OK, gas economy has increased by a solid 2 MPG. Getting 25-26 unofficially @ 70 MPH, 90 degrees and the A/C on.
I really like what you did with the tranny shifting, so much more driveable.
Thanks again Zack, and we will see you at a national or regional event again.
Regards,
Pat
Pat has the car and im pretty sure he is happy.
It made the 350 mile trip without issue.
+1, car made a 670 mile trip home OK, gas economy has increased by a solid 2 MPG. Getting 25-26 unofficially @ 70 MPH, 90 degrees and the A/C on.
I really like what you did with the tranny shifting, so much more driveable.
Thanks again Zack, and we will see you at a national or regional event again.
Regards,
Pat
Don't hold your breath. My july wedding is coming up very fast and I have a ton of things to do in preparation.
I'm painting my garage all four Marauder Colors.
Silverback continues to run great, oil changes clean, supercharger fluid changed, no consumption. Cooling mod is doing a great job in these triple digit temps, no hint of overheating. Thanks again Zack.
Went to the Texas Marauder meet in Waco, had a good time met some new drivers with preowned MM's including a gentleman who self installed his Trilogy. He did some great work on customizing the trunk of his car too. Pic's on MM.net site under North Texas Marauder Forum, Waco thread.
Marauderville registration and hotel are open for booking.
Regards,
Pat
Went to the Texas Marauder meet in Waco, had a good time met some new drivers with preowned MM's including a gentleman who self installed his Trilogy. He did some great work on customizing the trunk of his car too. Pic's on MM.net site under North Texas Marauder Forum, Waco thread.
Marauderville registration and hotel are open for booking.
Regards,
Pat
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