I had the DawesDevices Superduty Boost Controller installed by a friend and have used it for a few months now to my satisfaction. Last weekend my friend installed an Autometer mechanical boost/vac gauge which works fine. However, there are some mysterious problems that have happened a couple of times since the gauge was installed. First of all, after we installed the gauge, the car would not accelerate past 5-10 mph. We thought it was the computer not adjusting after we left a leak in the hose going to the gauge. So, we stopped up that hose and that didn't help. We then tried to reset the computer by pulling a couple of fuses and turning the key. We put back the fuses and the car ran fine. Then today I tried to go from 0-60 and the car was bucking. This happened in three consecutive attempts. I had to avoid giving it more than 5 psi boost or it would buck. Then after driving a couple of miles I tried it again and it ran fine with 10+ psi. I continued giving it more and more boost without any problem. What could be the problem? Could it be the installation of the boost gauge or just a coincidence like water in the gas or some other engine component going bad? Any thoughts? PS-I'm glad I finally installed a calibrated boost gauge. We power-braked the car and found out it was doing over 16 psi. Another question: since I had the boost controller set this high for like 4 months, how would I know now if there has been any damage? -Replies are much appreciated!...

I have heard the LH 2.4 Jetronic fuel injection, or the ignition, starts dropping off boost when you go over 14.5 psi on the LH 2.4 Jetronic. Installation of a new boost gauge should have no effect. The ignition system on your car has a fine knock detector and should eliminate any problems from detonation.

Thanks for the info on the LH Jetronic and the knock sensor. But would the computer and knock sensor function the same with the manual boost controller I have installed? I was planning on setting the boost for 13 psi. If the knock sensor drops boost at 14.5 psi, then I'm not going to worry to much about detonation. Thanks for the reply!

sounds like someone knocked a sensor wire off, check the wires going to the mass air meter or the t/p sensor

I believe I found the problem: I read the FAQ for the boost controller which says to keep the tiny breather hole clear. I cleared the hole with a pin and did a test drive. The car ran fine. Another question: since the boost controller is regulating boost, will this interfere with computer control of other aspects of the engine like the knock sensor? I want to avoid detonation. Thanks for the reply!