I should have asked the seller why the IMRC cover was off when I bought my car (plus a dozen other questions...C.org member). Anyway, I finally took my C-SVT up to triple digits - on a privately owned road, of course; mods...
In fifth, it took forever to hit 100mph; in fourth, it got to 110mph...I expected 125.
The IMRC is not pulling the secondaries open. I feel nothing around 3250 rpm, but maybe something at around 4k. I revved the engine in the driveway and the cable was pulling. The intake sound got deep a couple of times, but not everytime. The cable was pulling each time I got to higher rpm.
What are the common problems? Cable binding? My 1995 Escort GT pulls harder than this car over 4k rpm!!
It shouldn't take long to hit 100. If your IMRC was not working, you would know it because the car would basically have NO acceleration above 4000. Try opening the IMRC case, pulling out the circuit board and motor, and spray the motor out with CRC Electrical Cleaner, then let it dry and put it back together. If that doesn't work, it's time for a new IMRC. Pick up one at the local junkyard for $10-20, or from a CEG'r for $40-50 shipped. Before you do that, check the silver rod right under the LIM, near the throttlebody to make sure that the front bank of the secondaries didn't come undone.
2009 Pontiac G8 GT
2000 SVT #0801 (sold)
2000 3L SVT #2094 (sold)
check the linkage for the IMRC. if the bracket connecting the two sets of butterflies isnt connected, that cable can pull on nothing all day long
R.I.P. CSVT "clockwork" totaled 10/29/10 n/a 3L 220whp 212 trq
I had similar behavior and it turned out the grommet that attached the IMRC relay arm to the front secondaries (radiator side) was broken off, so when the IMRC would actuate it was only on half the cyl and gave a less then satisfactory burble, the interesting thing to note is that there was no cell code either.
2004 Volvo V70 T5 Manual // 1999 Black/Tan CSVT #2658 of 2760 // 1989 Yamaha FZR600
Intermittent IMRC behavior points to a transistor on its way out.
A worn transistor operates normally at colder temperatures but can overheat and cause your secondaries not to open. After the car is nice and hot, open the hood and rev it up to see if the cable moves. If it doesn’t, that is your problem.
1998 CSVT 184 WHP/175 WTQ 233 WHP/215 WTQ w/Nitrous 75 shot
2005 Nissan Titan 305 HP stock
2002 Subaru WRX E85 356 WHP 345 WTQ (RR self tuned) EVO III 16G
2004 C5 Z06 Corvette
1988 RX-7 Turbo II (FC) Streetport 297 WHP/272 TQ SOLD
Early 98 Contours and a few mid 98 Contours have been known to have the same wiring harness failures as the recall for the pre98 Contiques (99M03 I believe?) In anycase for me I had the insulation breaking off of the wires going to my IMRC box. This causes some of the wires to short together intermittently, which causes my IMRC box to open/close at random. This was all burried under looming and was not visible until I took it off.
It wouldn't hurt to check your wiring going to the IRMC box as well for cracked/exposed wires.