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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500
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#888 of 2238 Whirling noise
Jun 25, 2001 (3:49 pm)
File In Section:
06 - Engine/Propulsion System
Engine Noise (Check/Replace Crankshaft Position Sensor)
1999 Chevrolet and GMC C/K Models (Silverado and Sierra) with 4.8 L or 5.3 L V8 Engine (VINs V, T -RPOs LR4, LM7) Built within the VIN breakpoints shown in image.
Some customers may comment on a whirling sound from the lower rear side of the engine. This occurs as the engine warms up, between 1500 and 2000 engine RPM. The sound may not be present on a cold engine.
The crankshaft position sensor may be making contact with the reluctor ring.
IMPORTANT: Dealers may encounter a few vehicles, shipped from the vehicle assembly plants, which have a 2nd rubber 0-ring installed over the crankshaft position sensor, and a copper shim under the mounting tab.
1. Remove the crankshaft position sensor (1), and check for witness marks caused by contact with the reluctor ring. Reference the Service Manual procedure as needed.
2. If no witness marks are evident on the crankshaft position sensor (1):
IMPORTANT: Do not place an additional shim washer (2) on the crankshaft position sensor (1), if one was not previously installed.
2.1. Reinstall the original crankshaft position sensor (1) with any 0-rings and shims that may have been previously installed.
Tighten the mounting bolt (4) to 25 Nm (18 lb ft).
2.2. Continue with standard diagnostic procedures.
3. If witness marks are evident on the crankshaft position sensor (1):
^ If a shim washer and/or 0-ring had been previously installed: call Technical Assistance for additional instructions
^ If a shim washer and/or 0-ring is not present:
3.1. Place a shim washer (2) P/N 12565102 on a new crankshaft position sensor.
3.2. Install the new crankshaft position sensor (1) with the mounting bolt (4).
Tighten the mounting bolt to 25 N.m (18 lb ft).
3.3. Perform the Crank Angle Sensing Error (CASE) re-learn procedure.
3.4. With the engine at operating temperature, verify the correction of the noise condition.
Parts are currently available from GMSPO.
For vehicles repaired under warranty, use chart.
#889 of 2238 Things that make you go Hmmmm
Jun 25, 2001 (3:57 pm)
Could it be that the carbon build-up in the cylinders is increasing the compression ratio, thereby, putting more pressure on the rod bearings?
Is it feasible that when they do the top engine clean that it takes the cylinders back to a stock ratio, thereby, reducing or eliminating the knock?
Just a couple of questions I've kicked around.
#890 of 2238 Westin spacers
Jun 25, 2001 (5:45 pm)
Well my westin spacers just arrived.
Came in a normal envelope. I was like, what is this?
They are definately not what I expected. But if they do the job!
There are 4- 1mm thick round plastic spacers.
Same size as the rubber cab mounts. you just put them inbetween the step bracket and the cab mount I guess.
#891 of 2238 Obyone-passlock/theftlock
Jun 25, 2001 (5:54 pm)
I believe Theftlock is for the radio, passlock is for the security system. Evidently to do with sensing the correct key in the ignition-funny the key looks like an ordinary key.
Jun 25, 2001 (10:31 pm)
A little secret. I had a key made a Home Depot using the old style C/K key. What happens when I use this spare key is that the rado starts up and runs normally. So much for the coded key. Now if someone used a screwdriver...well that might be a different story.
#893 of 2238 Seat Bulge??????
Jun 26, 2001 (4:55 am)
Obyone.......You sure your not the test marketer for GM? you come up with the weirdest problems, you must be kin to those crash test dummies only you get to try out the trucks before they crash'em, haha. I'd say a seat spring has dislodged from it's place thus causing the "bulge" and if you qualified for "lemon law" on that one I'd say the arbitrator has been puffin on that Maui Waui to long LOL. Home Depot replacement key starting the Rado??, so much for that computer chip in our key rings to prevent theft!
As for the engine knock were there any TSB's issued for that or did they just issue you the extended warranty to shut you up hoping you'd go away? Boy were they mistaken!LOL
Jun 26, 2001 (5:13 am)
Not sure what they did the last two times on the seat. All I know is that it went in with the material lifting on the seat and they returned it with the seat as flat as a pancake. Like they steamed it or something to make the material shrink. I guess they gave up and will be sending to upholtery shop.
They are also stumped on the child safety harness as I wanted one. GM sent two harnesses which both don't fit. So now they are looking for one that matches the picture in my service manual.
There are no TSB's for the knocking sound. Maybe if enough customers complain...they'd be forced to issue one.
#895 of 2238 2001 Knocking 5.3
Jun 26, 2001 (6:47 am)
When starting it sounds like lifters knocking like the oil pump lost its prime, and when you get above 2300 rpm it sounds like piston slap, truck has 12,000 on it, GM said thats normal I don't think so. If it weren't for the gas engine sounding like a diesel it would be a geat truck!!
#896 of 2238 Passenger Seat Rattle on '99?
Jun 26, 2001 (7:14 am)
Anyone experiencing a piter-patter type rattle coming from the Captains Chair Style passenger seat? Can't seam to locate source?
#897 of 2238 Coded key
Jun 26, 2001 (8:52 am)
The key is not coded on newer GMs, the smarts are in the key cylinder. There are hall effect sensors that put out a code read from the high and low spots on the key, sort of like the mechnical key locks. The computer knows what the code should be.
The neat thing about this system is that you can use normal keys. It is a great idea, more so if you ever had to buy a $100 dollar key!