turbo miss

jook24 · Nov 5, 2015

I have a 1996 frieghtliner with 3176B cat with 15 speed but drive it as ten speed when loaded with gravel end dump 9th or 10th gear it gets a trubo miss under load not in lower gears it won't do it until i have ran it for abit i can hear turbo goes silent then it will kick in don't feel the truck jerking the more fuel i give it the quicker it will do it if i just lightly feed it it not so bad when i get up to speed it quits unless i go down side road and hit soft spots it does'nt use oil regular filter fuel filter change starts good runs good but this has me stumped checked all conections to trubo sprayed eather around no change in rpms.can usally hear the turbo.any ideas

lantraxco · Nov 5, 2015

Turbos are pretty basic on those as I recall, they either work or they don't. My first guess would be something in the fuel system or fuel settings in the ECM... CAT guys, where are you? lol....

Nige · Nov 5, 2015

First thing - as usual - engine Serial Number...?

jook24 · Nov 5, 2015

9ck29128

Nige · Nov 5, 2015

Lantraxco's right, the turbo on that particular engine is a very basic non-wastegated model - It'll either work or it won't. Do you have any way of getting a boost gauge connected on to the inlet manifold so that you can see what the boost pressure is doing when the engine starts acting up..?

Does your truck have a Cruise Control on it..? If it does the buttons for the CC can be used to identify Diagnostic Codes.

Edit: Also try removing the air intake line at the turbo and spin the compressor wheel. Does it spin freely..? Can you feel any movement, either side-to-side or in-and-out in the compressor wheel..? Can you see any signs that the compressor wheel has been rubbing on the turbo housing..?

jook24 · Nov 5, 2015

Nige said:
Lantraxco's right, the turbo on that particular engine is a very basic non-wastegated model - It'll either work or it won't. Do you have any way of getting a boost gauge connected on to the inlet manifold so that you can see what the boost pressure is doing when the engine starts acting up..?

Does your truck have a Cruise Control on it..? If it does the buttons for the CC can be used to identify Diagnostic Codes.

Edit: Also try removing the air intake line at the turbo and spin the compressor wheel. Does it spin freely..? Can you feel any movement, either side-to-side or in-and-out in the compressor wheel..? Can you see any signs that the compressor wheel has been rubbing on the turbo housing..?

yes it does have cruise I haven't had no check engine light come on.I have checked the turbo and it spins freely and looks good no signs of rubbing.I think I will take it to a guy get him to check fuel pressure and so on I seen that my lift pump is damp so it might be seeping to.I'll see what he finds and repost thanks for your help

lantraxco · Nov 5, 2015

Nige, does that model have a boost or manifold pressure sensor? The B I think is all electronic, previous version would have had a boost line running to the injector pump aneroid diaphragm maybe.

Nige · Nov 5, 2015

Yes there is a boost pressure sensor, mounted right on top of the inlet manifold.

To the OP, try this ....... you can use the CC controls to identify Diagnostic Codes. Post any Codes you find back here.

The Cruise Control Switches are used to prompt the ECM to provide the system status by flashing the check engine lamp. Turn the ignition key to the ON position with the Cruise Control On/Off Switch in the OFF position. Hold the Set/Resume Switch in either the SET or RESUME position until the Check Engine/Diagnostic lamp begins to flash to indicate one or more two digit flash code(s). The diagnostic lamp will flash diagnostic codes that have occurred since the ECM was powered up.

The sequence of flashes represents the system diagnostic message. The first sequence of flashes represent the first digit of the diagnostic code. After a two second pause, a second sequence of flashes will occur which represent the second digit of the diagnostic code. Any additional diagnostic flash codes will follow after a pause and be displayed in the same manner.

If the system displays a Flash Code 55 (No Detected Faults) when reading diagnostic flash codes, the system has not detected any system faults since the last power up.

jook24 · Nov 5, 2015

Nige said:
Yes there is a boost pressure sensor, mounted right on top of the inlet manifold.

To the OP, try this ....... you can use the CC controls to identify Diagnostic Codes. Post any Codes you find back here.

The Cruise Control Switches are used to prompt the ECM to provide the system status by flashing the check engine lamp. Turn the ignition key to the ON position with the Cruise Control On/Off Switch in the OFF position. Hold the Set/Resume Switch in either the SET or RESUME position until the Check Engine/Diagnostic lamp begins to flash to indicate one or more two digit flash code(s). The diagnostic lamp will flash diagnostic codes that have occurred since the ECM was powered up.

The sequence of flashes represents the system diagnostic message. The first sequence of flashes represent the first digit of the diagnostic code. After a two second pause, a second sequence of flashes will occur which represent the second digit of the diagnostic code. Any additional diagnostic flash codes will follow after a pause and be displayed in the same manner.

If the system displays a Flash Code 55 (No Detected Faults) when reading diagnostic flash codes, the system has not detected any system faults since the last power up.

there was two flashes of 5

Nige · Nov 5, 2015

55 - No detected Faults. That seems (and I say that advisedly) to rule out the electronic side of things but I wouldn't guarantee it 100% just yet.

Best thing to do now is to plug a mechanical gauge into the manifold somewhere, maybe even put a tee into the boost pressure sensor port and run a line off it, and run a hose into the cab so you can measure the boost pressure in real time when the engine starts playing up.

jook24 · Nov 5, 2015

ok I will do that thank you

lantraxco · Nov 6, 2015

Check the wiring on both those sensors, look for rubbing or places where it might be crimped. The sensors themselves can do weird things and cause all sorts of issues without being far enough out of range to throw an error code. Just sayin'.

Shimmy1 · Nov 6, 2015

How long since last fuel filter change? Just because they get changed regularly doesn't guarantee that they are good. How about air filter? Have you watched in the mirror to see if it's smoking or not when you lose power?

jook24 · Nov 11, 2015

Shimmy1 said:
How long since last fuel filter change? Just because they get changed regularly doesn't guarantee that they are good. How about air filter? Have you watched in the mirror to see if it's smoking or not when you lose power?

checked the wiring there was a couple that were cracked and the one plug that goes into the ecm was corroded so cleaned it up driven it now for a bit seems good now.

mike in idaho · Nov 15, 2015

+1 on the fuel filters. Another thing to check is the fuel line between the tank and the filter, after 19 years it is possible for the interior lining of the hose to degrade and pieces of rubber to impede the fuel flow. A fuel restriction gauge, mounted between the filter base and the lift pump, is a handy thing to have.

Oxbow · Nov 15, 2015

A foil flap off of a bottle of fuel additive can cause problems in the fuel tank too.

turbo miss

jook24

Well-Known Member

lantraxco

Senior Member

Nige

Senior Member

jook24

Well-Known Member

Nige

Senior Member

jook24

Well-Known Member

lantraxco

Senior Member

Nige

Senior Member

jook24

Well-Known Member

Nige

Senior Member

jook24

Well-Known Member

lantraxco

Senior Member

Shimmy1

Senior Member

jook24

Well-Known Member

mike in idaho

Well-Known Member

Oxbow

Senior Member