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Blown 96-98 Cobras, I have a few Qs

  • Thread starter Thread starter cmb91LX
  • Start date Start date Jun 29, 2005

cmb91LX

New Member
Apr 20, 2004
432
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0
Memphis
Jun 29, 2005
#1
  • Jun 29, 2005
  • #1
Ok guys, I just picked a 97 Cobra yesterday:

97 Cobra Black/Black(newly aquired)
Procharger P600B,90MM MAF, 30LBs, Dynospeed tune,
Pro 50 shifter, 410s, Dr gas, 2 Chamber flows
D&D tubular K and A arms, Steeda LCAs, FRPP uppers
M/M camber plates
420/435 at the wheels


. I have noticed a few little things that I want to find more about.

As the car decelerates to a stop, the idle will hang @12-1500RPMs for 5-10 seconds, not all the time but it has done it a few times. I am hoping that this is just the Procharger holding up the revs or something. I couldnt find any vacuum leaks so this is my next guess. Any suggestions?

When I am really in it, it will take off HARD then feel like theres no blower for a split second, then pull hard again, then feel like the blower is off, then hard,etc, etc. Someone mentioned belt slippage. I thought these engines had belt tensioners to keep the belt tight or does this change altogether with the blower? I know it is not detonation, misfire, etc because the car was just tuned by a very capable shop and A/F was right where it needed to be. Does slippage sound like the culprit?

I have noticed that the car seems to stay between the M and the A in NORMAL on the temp guage. Is this normal? I have never owned a supercharged car before but I know when I get out, the car is WARM and the engine too. Possible cooling system problem? Also, it seems to rise quicker with the AC on.

Anyway, sorry for the long post but if anyone can shed some light ont his for me, it would be great. I would really love to enjoy my Cobra without constant paranoia that something is wrong. Thanks
 
E

Evan5469

Founding Member
Apr 8, 2002
311
0
0
Maryland
Jun 29, 2005
#2
  • Jun 29, 2005
  • #2
Not 100% sure about the first one but I would check the IAC valve. It may be sticking and holding the idle up. Clean that with some carb cleaner or depending on if it's still the original it may need to be replaced ($60 or so).

The second problem could be belt slippage or it could also be the clutch slipping.

Third question. That is a bit on the warm side. Does the S/C have an after or inter cooler? Has the radiator been upgraded?
 

cmb91LX

New Member
Apr 20, 2004
432
0
0
Memphis
Jun 30, 2005
#3
  • Jun 30, 2005
  • #3
Evan5469 said:
Not 100% sure about the first one but I would check the IAC valve. It may be sticking and holding the idle up. Clean that with some carb cleaner or depending on if it's still the original it may need to be replaced ($60 or so).

The second problem could be belt slippage or it could also be the clutch slipping.

Third question. That is a bit on the warm side. Does the S/C have an after or inter cooler? Has the radiator been upgraded?
Click to expand...

Does the procharger come with a different tensioner to adjust this belt or what can I do from here? Wouldnt I smell clutch if it was slipping?

The car does have an intercooler, but I dont think the radiator has been upgraded.

Any more ideas?
 

cmb91LX

New Member
Apr 20, 2004
432
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0
Memphis
Jun 30, 2005
#4
  • Jun 30, 2005
  • #4
ttt
 
E

Evan5469

Founding Member
Apr 8, 2002
311
0
0
Maryland
Jun 30, 2005
#5
  • Jun 30, 2005
  • #5
The procharger should have a tensioner to keep the belt tight. Without the engine running try pulling on the belt and see how lose or tight it feels. If you can stretch it a good bit replace it with one that's a little shorter.

And my clutch has been slipping for awhile now and I couldn't smell it until recently which is why the car is sitting waiting for a new clutch. But anyway, you may not be smelling it yet but the affects are already taking place.

And also I would highly recommend upgrading the radiator. My car stays stuck right on the R in NORMAL no matter how bad traffic is, how hot it is or how bad I beat on it.
 

cmb91LX

New Member
Apr 20, 2004
432
0
0
Memphis
Jun 30, 2005
#6
  • Jun 30, 2005
  • #6
What exactly does a clutch slipping feel like? Does it feel like a miss, a hesitation, what?
 

SVT98Snake

New Member
Apr 15, 2005
258
0
0
OK, USA
Jul 1, 2005
#7
  • Jul 1, 2005
  • #7
cmb91LX said:
What exactly does a clutch slipping feel like? Does it feel like a miss, a hesitation, what?
Click to expand...

Your RPM's can rise quickly...usually accompanied by a smell and sometimes a chatter. (watch your speedo, if the RPM's rise and the speed stays the same, it is your clutch)

Another experience I ran into in my old procharged 89 5.0 was that the rpms hung. They didn't rise or fall...it slipped just enough and grabbed just enough...kind of like it was alternating between slipping and grabbing...just made it seem like I was going nowhere.

If it seems like it is missing, it is either fuel or ignition. If you don't have an aftermarket ignition, get one.
 

hersheyman

New Member
Jul 15, 2004
67
0
0
Oklahoma
Jul 1, 2005
#8
  • Jul 1, 2005
  • #8
I don't have a blower, but my temp gauge stays between the "NOR" range.
 
M

midlifecrisis99cobra

Founding Member
Jun 2, 2000
420
0
16
Plano,Texas,USA
Jul 1, 2005
#9
  • Jul 1, 2005
  • #9
I've read a lot of threads that indicate that Ford's guages are something less than accurate/responsive. I'd get a good water temp guage. Once mine warms up the needle never moves, traffic/30deg/110 deg/thrashing/idling.
 
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