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I just got my car back and it is bogging bad. I dont know what it could be. Its like when I start in first it hesitates then its like the power just cuts on at about 3500 rpm. Its like that in every gear does anyone know what it could be? It was doing it with my old engine then I upgraded to a 3.0 and it is still doing the same thing. I know this engine only has 3k on it.
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Joined: Mar 2005
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Originally posted by con_svt_tour:
I just got my car back and it is bogging bad. I dont know what it could be. Its like when I start in first it hesitates then its like the power just cuts on at about 3500 rpm. Its like that in every gear does anyone know what it could be? It was doing it with my old engine then I upgraded to a 3.0 and it is still doing the same thing. I know this engine only has 3k on it.
two things this could be
any CEL lights?
sounds like it may be a fuel problem but teh issues are usally the opposite way u explained,
get ur fuel pressure checked,
find out if ur car is getting any unwanted knock causing ur car to retard teh timeing
i am to tired to think otherwise id give more insite hehe
ill try again tomarrow
1997 30th Anniversary SS,Jethotts/ORY/GMMG, 160thermo, ,TB bypass, 1LE intake elbow, BMR STB, 32mmswaybar..21mm rear,BMR LCAs, PR,SFCs,TA,LT4 KM,255lph, shift kit
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Joined: Sep 2003
Posts: 148
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Yo man, it is a very common problem. i am some what going through the same thing. What you most likely need to do is get a new IMRC (Intake Manifold runner control) box. it controls your secondaries, which is what gives you most of your power after 3500RPM. This most definitely sounds like the source of your problems.
An easy way to check is start the car, pop the hod, manually push the throttle in and see if the little connector to your secondaries moves once your RPM's rise. If it doesnt, you need a new IMRC, or you need a serious cleaning of your UIM and LIM (it may be stuck on gunk).
Hope this info helps you.
1998 Black SVT (#469 on 4-24-1997)
Custom Cougars CAI
Custom Magnaflow exhaust
opt. jet-hot-coated Y-pipe
B&M short shifter
Stazi Rotor & Brake kit
17x7 Enkei RO56's
Mirco Splitter
15.45 @ 89.03 (Stock /w worn clutch)
172HP 164TRQ (stock)
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Joined: Apr 2005
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Thanks But what is UIM and LIM. I dont really know much about svt's this is my first one. I just ran a code reader and it said cylinder 5 misfire dectected? What can cause that?
Last edited by con_svt_tour; 04/30/05 09:18 AM.
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I noticed that my car once had a supercharger. The code read P0305 which means cylinder 5 misfire. We changed the coil. Then erased the code that part was ok. It still kept bogging. So then we changed the mas air unit, that helped out alot. But still that didnt eliminate the problem. Then thats when we noticed it had a chip in the car vortech superchip. We removed it, still didnt help. It bogged until I got on the freeway, then it was ok until I got home and there it goes again. Anybody has any idea?
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Joined: Nov 2003
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Addicted CEG\'er
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How do you notice that it once had a supercharger? If it had the vortech... uhhh ohhhhhh.. 
2006 Pontiac G6 3900SFI GTP Coupe
CAI, Stainless Cat Back, Vector Tune, Strut Brace, Eibach Pro Kit, Custom Made Projector Headlights, 4300K, 20% Tint
Former Owner- 2000 "Stryped" CSVT
CEG Dragon Run- Oct 13-15
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The who owned the car perviously before me told the owner at my old job (Salvage Yard) that it had a supercharger but I couldnt tell until looked at the processor that there is a superchip that says on the back of it the vortech part number, serial number, and some other part numbers then it taped to the back of it with vortech tape.
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I GOT IT DIAGNOSED AT FORD THEY TOLD ME IT WAS THE SPARK PLUGS- THERE ARE TOO HOT OF A SPARK OR SOMETHING LIKE THAT- THEY WANT ME TO CHANGE MY PLUGS AND WIRES AGAIN- THEN COMP TEST THE ENGINE. THEY TOLD ME IT WILL MISFIRE ALL THE WAY THROUGH THE CYLINDERS. BUT THEY WANT TO COMP TEST CYLINDER 5, SINCE CODE READ P0305
WHICH MEANS CYLINDER 5 MISFIRE
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1999 Mystique Sport 2nd owner bought it in Sept 03
120000km 4 door, leather, loaded pics on cardomain, coatsy
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Vortech's have a reputation for detonation.....not good....especially since it was removed.
A1C Hodges, Christopher Active Duty USAF Sheppard AFB Texas;Westover ARB Chicopee, MA
NECEG "Troll"
formerly owned 2000 SVT Contour, with all kinds of goodies;)
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