Supercharged/Turbocharged The increase in air/fuel pressure above atmospheric pressure in the intake system caused by the action of a supercharger or turbocharger attached to an engine.

Well here is a head scratcher!

Thread Tools
 
Search this Thread
 
Old May 19, 2006 | 08:14 AM
  #1  
chris'smax's Avatar
Thread Starter
Senior Member
iTrader: (3)
 
Joined: Jul 2003
Posts: 2,447
Well here is a head scratcher!

We have finished the swap, but the idle is almost non existent and my boost guage shows only 3hg of vaccum. We used a smoke machine to find and fix any leaks. After doing this we are now seeing 3 hg of vaccum at 700rpm where as you should see about 15-20hg of vaccum. Without any throttle given the car will idle at 700rpm steady for a few seconds then die out. Now if i rev it to 1000 rpm and hold it the cars runs smooth and the vaccum improves to around 10hg.

Now this is where it gets interesting. As i give it throttle the vaccum automatically increases. At around 1300 rpm i am getting 17hg of vaccum(WTF). We are now thinking that the cam timming may be off. Also when revvig it to around 4k-5k rpm it feels like it isn't getting full power(revs slower than normal). Does anyone have any suggestions as to what may be going on here? Could it be a simple adjustment to the throttle body needed?

I am getting no codes and my AFR is at 14.7 at 1000rpm. Also the maf voltage reading on the obd2 scanner showed 1.7 which is within spec
Old May 19, 2006 | 06:44 PM
  #2  
turbomax97's Avatar
I couldn't fix your brakes, so I made your horn louder
iTrader: (6)
 
Joined: Jan 2002
Posts: 2,586
I really doubt cam timing is off... it's very unlikely that a cam gear jumped the chain. Sounds like maybe you have a maf issue, or leaky injectors....
Old May 21, 2006 | 09:41 PM
  #3  
h2kFrosty's Avatar
Supporting Maxima.org Member
iTrader: (3)
 
Joined: Jun 2002
Posts: 920
lmaonade... the snowmobile will be finished first at the rate you're going. no more trash talking travis for you.. airline auto ftl
Old May 21, 2006 | 11:26 PM
  #4  
SPiG's Avatar
SomePsychoGuy
iTrader: (7)
 
Joined: Sep 2003
Posts: 1,943
From: Baton Rouge, LA
4 months < over a year

You still lose on a technicality.
Old May 21, 2006 | 11:26 PM
  #5  
SPiG's Avatar
SomePsychoGuy
iTrader: (7)
 
Joined: Sep 2003
Posts: 1,943
From: Baton Rouge, LA
Well until either car is done neither of you win.
Old May 22, 2006 | 09:39 AM
  #6  
Bags's Avatar
VG Ridah's Biatch Hoe
iTrader: (3)
 
Joined: Apr 2001
Posts: 8,472
Originally Posted by turbomax97
I really doubt cam timing is off... it's very unlikely that a cam gear jumped the chain. Sounds like maybe you have a maf issue, or leaky injectors....

truer words have never been spoken. I had an idle issue with a vaccum issue. 2 of my maf wires were shorted together and the 3rd MAF wire was broken.

Check you MAF wiring and check your maf

Got a SAFC or obdII tool? check the % flow or Voltage on your maf when your car starts and when you rev it
Old May 22, 2006 | 09:46 AM
  #7  
virgilio7's Avatar
Senior Member
 
Joined: Nov 2005
Posts: 165
checking it with a saf2, what is the percentage for a 3.5?
Old May 22, 2006 | 10:02 AM
  #8  
nismology's Avatar
Supporting Maxima.org Member
iTrader: (8)
 
Joined: Apr 2003
Posts: 9,099
From: Miami, FL
Originally Posted by Bags
truer words have never been spoken. I had an idle issue with a vaccum issue. 2 of my maf wires were shorted together and the 3rd MAF wire was broken.

Check you MAF wiring and check your maf

Got a SAFC or obdII tool? check the % flow or Voltage on your maf when your car starts and when you rev it
The compression numbers were all low on the front bank. The timing chain indeed jumped a tooth or so.
Old May 22, 2006 | 11:03 AM
  #9  
SPiG's Avatar
SomePsychoGuy
iTrader: (7)
 
Joined: Sep 2003
Posts: 1,943
From: Baton Rouge, LA
He checked the MAF signal. It looked within spec, although he is scaling it back with EMB for the injectors. The shop also did a smoke test to find vacuum leaks and couldn't find any.

Consitant low compression only on one bank would have nothing to do with MAF, injectors, etc. If it were lower and only two of the cylinders on one bank I would suspect head gasket.

Originally Posted by TurboS13Hatch
It's hard to build a car when the funds aren't there to build it.... and the setup changes as drastically as it has. I salute the guy that works at Domino's, and can fork out the kind of cash that he has on this setup. But, you can't do it overnight..
If this is in response to my comments, it was directed at frosty and not your business. I realize that frosty's funding is of course partly to blame for the timeframe his car is taking, but it was not my intent on commenting on your business actions on a public forum without instigation. That is between you and frosty and I am not involved. I also don't mean to tangent this thread to egypt and back. The ECU situation is the only thing that I am involved with you and I expect that to be resolved by June 1st. Anything else can be discussed via PM, AIM, or phone.
Old May 22, 2006 | 01:48 PM
  #10  
mtrai760's Avatar
'Trynna' is not a word
iTrader: (19)
 
Joined: Mar 2001
Posts: 7,079
From: Seattle Area, WA
Now, now, Lets keep this thread on topic so it doesn't have to go away, mmkay?
Old May 22, 2006 | 01:55 PM
  #11  
chris'smax's Avatar
Thread Starter
Senior Member
iTrader: (3)
 
Joined: Jul 2003
Posts: 2,447
Originally Posted by mtrai760
Now, now, Lets keep this thread on topic so it doesn't have to go away, mmkay?

drugs are bad, mmkay! ha i love that show


Anyways back on topic, the compression test showed the front bank averaged 135-145 while the back read 185-190. I guess that would explain the crappy idle. Should have the timming chain fixed by this afternoon and then we are going to slap everything back on and hope for the best
Old May 22, 2006 | 06:33 PM
  #12  
Kevlo911's Avatar
Kevlo for President
iTrader: (36)
 
Joined: Dec 2000
Posts: 35,755
From: Lake Orion, MI
SOOOOOOOOOOOOOOO

car running yet?


BTW Spig, Maxus is looking good right now I just changed the steering rack and now need a new wheel, if I can find a wheel, I will drive my car if not, I will ride with my buddy.
Old May 23, 2006 | 12:19 PM
  #13  
Bags's Avatar
VG Ridah's Biatch Hoe
iTrader: (3)
 
Joined: Apr 2001
Posts: 8,472
take this BS to pm or the SHOP exp forum.

Hijack another thread or continue in this one 1 week bans will start.

Start another thread if yall need to air some BS

Have a nice day
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
knight_yyz
5th Generation Classifieds (2000-2003)
12
Nov 1, 2015 01:34 PM
worldwiderecognized
6th Generation Maxima (2004-2008)
0
Sep 30, 2015 01:16 PM
jaydot901
7th Generation Maxima (2009-2015)
9
Sep 29, 2015 01:18 PM




All times are GMT -7. The time now is 12:34 PM.