Attention: TDR Forum Junkies 
Hi folks,
I've developed a mild engine surge that happens while cruising. I was driving on the highway today at about 65 with the cruise control on. We decided to pull into a rest stop for a minute and when I hit the brake pedal, the engine still held about 1500 rpms, like the cruise was still on. I hit the off button for the cruise and no result. I just turned the truck off and went inside. Came back out and everything was back to normal. No revving at idle. Further down the road the engine was surging about 150-200 rpms from time to time with no change in pedal input from me. No codes were thrown-I checked for them with my Smarty, however the ABS light came on for about 30 seconds, then went off. Nothing weird was happening with the brakes. This concerned me enough to turn around and go home because I had something similar happen about 6 months ago.
Back then it started off very gradually but progressively got worse. The engine was surging from time to time on local roads, not the highway. It threw codes that said it was the TPS. My shop replaced that and it was ok for a very short time-week or so. Then the engine began to rev up from idle when sitting parked on its own. Eventually it got worse to where it threw 9 different codes and started bucking, spitting black smoke, and surging wildly. The shop determined that it was the ECM but also found that they are not made anymore. They sent my original one out to be rebuilt and this solved the problem. When they read the codes to the guy at the rebuild shop, he recognized the problem right away and said it was quite common.
I've had no issues until today. At first I was thinking that the ECM was going down again, but I started reading about this here and on other forums. The one thing that I keep finding is electrical noise, potentially from the alternator, is affecting the APPS. A bunch of people said the BD noise isolator worked great to fix this on their trucks with auto transmissions because it was causing the torque converter to lock/unlock. While I have a 6 speed, everything else sounds exactly like what is happening to me. Would a noise isolator help me? Is there anything else I should be looking at?
Thanks,
I've developed a mild engine surge that happens while cruising. I was driving on the highway today at about 65 with the cruise control on. We decided to pull into a rest stop for a minute and when I hit the brake pedal, the engine still held about 1500 rpms, like the cruise was still on. I hit the off button for the cruise and no result. I just turned the truck off and went inside. Came back out and everything was back to normal. No revving at idle. Further down the road the engine was surging about 150-200 rpms from time to time with no change in pedal input from me. No codes were thrown-I checked for them with my Smarty, however the ABS light came on for about 30 seconds, then went off. Nothing weird was happening with the brakes. This concerned me enough to turn around and go home because I had something similar happen about 6 months ago.
Back then it started off very gradually but progressively got worse. The engine was surging from time to time on local roads, not the highway. It threw codes that said it was the TPS. My shop replaced that and it was ok for a very short time-week or so. Then the engine began to rev up from idle when sitting parked on its own. Eventually it got worse to where it threw 9 different codes and started bucking, spitting black smoke, and surging wildly. The shop determined that it was the ECM but also found that they are not made anymore. They sent my original one out to be rebuilt and this solved the problem. When they read the codes to the guy at the rebuild shop, he recognized the problem right away and said it was quite common.
I've had no issues until today. At first I was thinking that the ECM was going down again, but I started reading about this here and on other forums. The one thing that I keep finding is electrical noise, potentially from the alternator, is affecting the APPS. A bunch of people said the BD noise isolator worked great to fix this on their trucks with auto transmissions because it was causing the torque converter to lock/unlock. While I have a 6 speed, everything else sounds exactly like what is happening to me. Would a noise isolator help me? Is there anything else I should be looking at?
Thanks,
