Turbocharger Troubleshooting Issue on 6.5L Diesel

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

I have a puzzler for you folks. When our ‘98 crew cab lost its power, the dealer in our town diagnosed it as having a failed turbocharger. He replaced the turbocharger and everything was fine for three days and then the problem was back. This time around he replaced the turbocharger control valve and it ran fine for two months. We think that was all that was really wrong in the first place, but too late now. Now, it is up to its old trick again and it makes a weird hissing sound, as well. I called the service manager who told me to look for a blown intake manifold gasket. I see no issues, but really don’t know much about this sort of thing and hate to take it back in to them. Can you offer any advice with so little to go on? Trevor K.


Braking Issue on 2500 6.5L Diesel

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

I hope you can help me with a brake problem. The brakes on my 2500 4x4 Suburban pull to the right when I first touch the pedal. It is only a slight tug, it does not feel at all dangerous and it stops straight. However, it wasn’t that way when new, so I know this isn’t right. I have had the front pads replaced and when that didn’t fix it, the shop changed the rotors. When that failed to solve the problem, they changed the rear drums and shoes. They also replaced all of the little springs and things on the shoes to make sure everything is like it is supposed to be. The problem persists. Can you help with any ideas about what to do next? PS We really like the magazine and consider it to be a great investment! Bill J.


6.5L Diesel Fuel Pump Clatter after Engine Shut Off

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

Why does my fuel pump sometimes continue to clatter away after I shut the engine off? It only does this on occasion and makes me wonder if it is going bad. Can you tell enough from this to give me advice? Ed C.


Ticking Noise in 1995 K2500 GMC 6.5L Diesel

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

If you can help me solve this one, I’ll buy lunch! My ‘95 K2500 GMC has a ticking noise coming from the engine since the shop installed a new A/C pump. I can hear the ticking all the time that the engine is running except when I am coasting at speeds above about 35 MPH. If I let off the throttle at 70 MPH, the noise stops until I get down below about 35, at which point I begin to hear it again. It isn’t just me – everyone who rides in or drives it can hear the same noise. The shop says it is my tappets, that they are gummed up. Another shop guy thinks it is a broken piston. The noise was not there till the A/C repair. Any ideas for me? Remember, I buy lunch! Thanks for the great magazine! Rudy in Norway.


Cruise Control Issue with 1994 Suburban 6.5L Diesel

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

I hope you can help me with a question about my 1994 Suburban diesel; when I am driving on cruise control, it will sometimes get into a chugalug situation. When it does this, it is like you are punching the throttle up and down. I have to turn off the cruise to get it to stop this jerking. It can be especially bad when going down a grade, even a minor one. My dealer has already replaced the multi-switch that turns it on as well as the speed sensor and the engine controller computer box. While all this cost plenty, none of it made any difference. There is no change and I am out of options. Any help is welcome. Thanks Tommy.


6.5L Diesel Chaos after Engine Computer was Replaced

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

I hope you can help me out. I have a big mess on my hands. Recently my ‘98 Chevrolet dually had a transmission shifting problem. I had a reputable shop rebuild the transmission. They also replaced the engine computer, saying it had gone bad at the same time. The transmission seems to be OK but now our truck runs terrible. It starts fine when it has been sitting overnight and it runs OK until it starts warming up. Then, suddenly, it will begin to run lousy and smoke like heck. It is now useless. I can’t drive it because, about the time I get a little ways down the road, it goes bad on me! If I let it sit long enough to cool off completely, it runs fine again for a short time. That shop has spent untold hours trying to fix this problem. Now, after I have spent a truck load of money, the manager of this place has given up and tells me it must be a problem with the wiring and that he does not want it in their shop again. Any help you can offer is greatly appreciated! Desperate in D.C.


Problems Following Fuel Injection Pump Installation

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

I run a hauling service with a ‘97 GMC 3500 HD flat bed truck. We had a new fuel injection pump installed recently and, after the repair, the service engine light was on much of the time. The engine also idles faster than it used to and we find that the transmission will not make the final shift and go into overdrive like it used to. We have taken it back to the shop four times and they tell us the transmission is going bad, causing the engine to idle fast. They also say the service engine soon light is shorted out, that nothing is wrong. Their solution was to remove the bulb to stop that annoyance. At this point we are not so sure these guys really know what they are doing. We thoroughly enjoy your magazine and hope you can you offer advice? J.B.H.


Proper Cold Start Performance for 6.5L Diesel Engines

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

Well, I am finally admitting defeat; I have exhausted every resource I can think of in trying to solve a problem with my 1994 6.5 liter diesel turbo Chevrolet. It has spent time at five dealerships, eight independent service shops and I don’t know how many different folks have given me opinions on what is wrong. This truck has had a problem getting started in the morning and has since about the time the engine was rebuilt. It starts quickly enough, but then immediately begins to belch smoke, shake and run rough. On the cooler mornings, it will stumble to a stop.



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