HOW TO: Diagnose your 4x4 system. ESOF
07-10-2016, 09:31 AM
#281
Senior Member
Great thread here - I could use some help troubleshooting... (Background info) - When I first bought my truck I could shift into 4X4 high but not 4X4 low, so I replaced the solenoid and that fixed the problem. I also needed to replace the passengers front hub assembly as it had play in the wheel, so that is done. I did the diagnosis with my truck on a lift and the 4X4 system checked good - IE 4X4 would engage and disengage.
My problem is that after I drive at long distances (approx >50miles) and fast (avg. >55mph) I will sometimes get a rumble and faint grinding when I am turning and/or accelerating at slow speeds. It sounds like the truck is partially engaged in 4X4, but I don't normally have this problem during daily driving. It has also only happened occasionally and sometimes it doesn't do it at all after a long drive. Does anyone know what may cause this issue?
My problem is that after I drive at long distances (approx >50miles) and fast (avg. >55mph) I will sometimes get a rumble and faint grinding when I am turning and/or accelerating at slow speeds. It sounds like the truck is partially engaged in 4X4, but I don't normally have this problem during daily driving. It has also only happened occasionally and sometimes it doesn't do it at all after a long drive. Does anyone know what may cause this issue?
07-10-2016, 12:25 PM
#282
Senior Member
07-10-2016, 12:31 PM
#283
Senior Member
Sorry, I don't know how I missed that. I guess the next step would be to measure the vacuum at the IWE's.
07-16-2016, 04:59 PM
#285
Senior Member
Okay, so I have done more testing and diagnosis but the results are still inconclusive so I would really appreciate any insight someone might have.
Today, I was able to use a lift and have all 4 tires off the ground at the same time. Engine off the half shaft would spin. Engine on in 2wd the half shaft would still spin, and opposite tire would not. Engine on in 4x4 high and low the half shaft would still and, the opposite tire would rotate in the opposite direction.
When I tested the modes in drive only the 2 rear tires would drive in 4X2, and all would drive in 4X4 high and low. When I then went back to the 4X2 all tires would rotate until I went to reverse, and then back to drive, and then it would go back to only two rotating. Does anyone know if this is normal? How about the half shafts rotating in every mode?
Today, I was able to use a lift and have all 4 tires off the ground at the same time. Engine off the half shaft would spin. Engine on in 2wd the half shaft would still spin, and opposite tire would not. Engine on in 4x4 high and low the half shaft would still and, the opposite tire would rotate in the opposite direction.
When I tested the modes in drive only the 2 rear tires would drive in 4X2, and all would drive in 4X4 high and low. When I then went back to the 4X2 all tires would rotate until I went to reverse, and then back to drive, and then it would go back to only two rotating. Does anyone know if this is normal? How about the half shafts rotating in every mode?
07-17-2016, 07:55 AM
#286
Mark
iTrader: (1)
Need to troubleshoot the wheel ends with a vacuum pump.. I suspect the drives side IWE has a bad seal or is full of gunk.
07-17-2016, 01:03 PM
#287
Senior Member
I guess I'll have to try that next. I'm going to be moving soon and driving at least 2K miles, potentially towing a VW Golf as well. Will driving at high speeds damage the IWE or Hub even if I'm not getting vibrations or noises?
07-17-2016, 01:05 PM
#288
Senior Member
I'm just confused as to why the half shafts would spin with the engine on in 2wd when i manually rotate the tires but when I shift to drive only the rear tires would spin..?
08-25-2016, 10:03 PM
#289
Senior Member
Alright, so I've done extensive troubleshooting and research and it would be great if some members could help me determine the best plan of action.
All background info stays the same. Today, I tested both IWE's with a vacuum hand pump. The drivers side would leak slowly (approx fully depleted from 20psi in 90 seconds) but it would disengage and not turn the half shaft while I spun the wheel. The passengers side would not hold a vacuum at all. As I pumped it up, it would immediately deplete. Therefore I have ruled the passengers side to be bad and the drivers side to be fair - not sure if it needs to be replaced or not, but likely I will.
The bigger problem is that I am not getting any vacuum at the ends of the hoses connecting to the IWE's. I found a severed line on the passengers side going to the solenoid. I was getting vacuum at the solenoid, and the solenoid was replaced about 3 months ago. My question is how everyone would recommend replacing that line and if I should repair that section or the entire line. Also if anyone has experience or knowledge about this repair it would be much appreciated!
All background info stays the same. Today, I tested both IWE's with a vacuum hand pump. The drivers side would leak slowly (approx fully depleted from 20psi in 90 seconds) but it would disengage and not turn the half shaft while I spun the wheel. The passengers side would not hold a vacuum at all. As I pumped it up, it would immediately deplete. Therefore I have ruled the passengers side to be bad and the drivers side to be fair - not sure if it needs to be replaced or not, but likely I will.
The bigger problem is that I am not getting any vacuum at the ends of the hoses connecting to the IWE's. I found a severed line on the passengers side going to the solenoid. I was getting vacuum at the solenoid, and the solenoid was replaced about 3 months ago. My question is how everyone would recommend replacing that line and if I should repair that section or the entire line. Also if anyone has experience or knowledge about this repair it would be much appreciated!
08-26-2016, 05:41 AM
#290
Mark
iTrader: (1)
Severed vacuum line - no vacuum to the IWE.. Yes replace it and retest Iwe's
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