I have managed to get myself a 4.7k ohm resistor to do the IAT bypass, however its not a 1/2 Watt its 1 Watt as thats all I could get. Before I stick it in the harness and turn the ignition on will this larger resistor cause a problem for anything? particularly the PCM?

Also I have a 1/2 Watt 2.2K ohm resistor for the CAGS bypass, but when I test the resistor with a meter it reads 1.5k ohms. I calibrated the meter first against some other resistors that had color band coding that agreed with the meter reading, so which do I believe? Or is the color band coding enough to go by.

I'd appreciate any replys, thanks!

Scott

 

Hey Scott, always glad to help out our Camaro brothers across "the pond".

To answer your questions, 1) Using the 1 Watt 4.7Kohm resister instead of the 1/2 Watt for the IAT system should NOT harm your PCM, or any other part of your cars electrical system for that matter. You can always use a BIGGER wattage resistor, the problem occurs when you try and substitute a smaller wattage one, (thats when they heat up because they are NOT capable of dissapating enough heat for the current load).

2) Regarding the 2.2Kohm 1/2 Watt resistor for the CAGS system keep this in mind. The fourth (4th) color band on this resistor designates the +/- tolerance for the value of the resistor. A GOLD 4th band indicates that the resistors tolerance is +/- 5% of it's stated value. A SILVER 4th band indicates a +/- 10% tolerance, while NO 4th band (none) indicates a +/- 20% tolerance. So, if you have a 2.2Kohm resistor with NO 4th band on it, (i.e. having a +/- 20% tolerance), it could read as low as 1.76Kohm on a calibrated meter. Throw in some calibration error with the particular meter you're using and you COULD get an actual reading of only 1.5Kohm! Now the good news, since the CAGS resistor only "fools" the PCM into thinking that it's actually sensing the resistance of the CAGS solenoid windings, 1.5Kohm MAY(???) be enough to do it? Only way to know for SURE is to install that 1.5Kohm resistor in place of the CAGS solenoid and see if you get the dreaded SES light, (or throw ANY code associated with a faulty CAGS solenoid). And finally, if you don't want to do this install twice, then just get a 2.2Kohm 1/2 Watt resistor with a GOLD 4th band, and everything will be fine.

Hope this info helps?

 

Thanks for the reply!

I'll go out and plug the resistors in tomorrow, at least I can then say my car is modified as it is stock right now. I hope they work

That CAGS thing has nearly caused me to wreck my car a couple of times as I am often forced to pull out of side roads into fast moving traffic. I've only had the car for 3 weeks

 

You are aware that on your 95, all you need to do is disconnect the harness connector from the skip shift solenoid? You will still get DTC 84 set in the PCM, but no SES light. The "resistor" simply eliminates the code, but the code doesn't hurt anything and doesn't turn on the light.

Why are you putting the 4.7Kohm in the IAT circuit? The best you can nope for is an absence of the PCM pulling a small amount of timing when the IAT temperature goes very high. You can accomplish the same thing by relocating the IAT sensor away from the heat soak of the engine. That way, you still have the protection offered by the PCM keeping its ability to pull some timing in the event you actually get an elevated air inlet temperature. There have been a few dyno tests that actully showed a small power loss for the "resistor mod".