Suggestions for diagnostic elimination of possible causes?

IMBummed
30

Asked by Aug 14, 2014 at 07:08 PM about the Chevrolet Silverado 1500

Question type: Maintenance & Repair

I purchased used vehicle specifically to do some hauling, expected load approx. 3500 lbs. When vehicle was delivered, it lost oil pressure enroute home, down to 0, so it was left at my mechanic's shop. Sending unit(?) changed, he said it seemed fine.

Automatic transmission shift lever seemed sloppy (and could be "flopped around" by hand) and hard to move to me, and ignition switch sometimes "finicky."

Took off with trailer, within 4 miles, lost oil pressure again--gauge down to 0. No change in engine temperature, no noticeable engine noises like ticking or tapping or worse.

Ran several miles, stopped for two traffic signals. My sister heard high rpm from motor before transmission shifted at first stop. At second stop, I noticed the high rpms as I pulled out, and took my foot of the gas to encourage transmission to shift. Engine stalled, would not start up. My cousin noticed that when I tried to start, the hot battery cable (that runs to starter?) "jumped."

Truck taken back to shop on flatbed. Mechanic says he can't move drive shaft (?) and engine is seized. He says without dropping transmission (about 6 hours), he can't easily determine if problem is in engine or transmission.

Any suggestions? I took out a loan for this vehicle.

7 Answers

FordNut
135,435

First of all it does NOT take 6 hours to drop a transmission. Any shade-tree amateur mechanic can do it in a couple-three hours. At a shop with a lift, and experienced mechanic an hour or so . From there your question gets more difficult, loss of oil pressure could be a failed oil pump, and how your loss of oil pressure and transmission shifting problems are related....?

3 out of 3 people think this is helpful.
Js08016
52,195

I'm thinking you have an electrical problem of some kind. First thing I'd do is remove all the spark plugs and try to turn the engine by hand. If you can turn the engine by hand it's not seized. What year is your Silverado? Is it a stick or automatic? How many miles are on it? Check for blown fuses and, since you just bought it, check for damaged wiring harnesses. Someone may have rigged it up some how. HTH. -Jim

1 out of 1 people think this is helpful.
FordNut
135,435

Many years ago I knew a lady that had the transmission STOLEN right out of her Ford Fairlane ...get this...while she was in the grocery store, less than 30 minutes. Hard to believe I know but I came to get her, a neighbor, it was just flat gone..unhooked shift linkage, four nuts on U-Joint, slip out spline, and five bolts on bell-housing. before the days of cameras everywhere

3 out of 3 people think this is helpful.
IMBummed
30

Bought from a friend that has a small engine shop and has done all my lawn mower work for 10 yrs +. He towed with it a lot. Has 250,000. 2002 4x4, Automatic. Mechanic says he can't get to one of the bolts because (something about) of the position of the engine? He has done my work for about 20 yrs., small shop, he and one employee.

2 out of 2 people think this is helpful.
Js08016
52,195

I'm still leaning toward an electrical problem. I believe the drop in oil pressure was a false reading. As I suggested earlier try spinning the engine by hand. Another thing, switch on the headlights and try to crank it. Do the lights stay nice and bright or do they get very dim or go out. If the torque converter clutch (TCC) in the transmission is stuck on (locked) it will prevent the engine from turning as well. What exactly do you mean by the battery cable "jumped"? Did it spark, move, what exactly happened? HTH. -Jim

1 out of 1 people think this is helpful.
IMBummed
30

Jim, thanks for your thoughts on this. By "jumped" I mean moved. I didn't see it as I was in the truck, trying to start it.

1 out of 1 people think this is helpful.
Js08016
52,195

You're welcome. Glad to help. Check the bolts that hold the starter to the engine. Be sure they're tight. For the battery cable to move like that it sounds like the starter is "flopping around". This is not good. The starter is actually grounded by the engine block. So if it's not mounted securely it won't be properly grounded and may not crank. HTH. -Jim

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Starter diagnostics 1 answer

    When turning the key there is a grinding noise before the engine kicks over on my 5.3 L V8 4WD truck.

    2000 Chevrolet Silverado 1500

    -

    Maintenance & Repair

  • Loud knocking noise 5.3 53 answers

    I have a loud knocking noise coming from the engine . At first I thought it was comin from the top but when i get under it it's alot louder sounds like its comin from the oil pan. I had the transmissi...

    2005 Chevrolet Silverado 1500 Z71 Crew Cab 4WD

    -

    Maintenance & Repair

  • Need desperate help with trouble codes regarding emissions! 3 answers

    I need some help with some trouble codes. I have a 2000 Chevy Silverado 1500, 4x4, with 5.3l V-8 engine. Over the past week, I've had the following trouble codes: P0300 and P0137 (can't remember e...

    2000 Chevrolet Silverado 1500 LS Ext Cab Short Bed 4WD

    -

    Maintenance & Repair

  • 2007 silverado new body style cc wind noise 27 answers

    I PURCHASED A 2007 SILVERADO LT2 CC 4X4. Wind noise is terrible on upper drivers side doo, noise starts around 50mph and almost like the window is open at 70 mph. Any suggestions

    2007 Chevrolet Silverado 1500 LT2 Crew Cab 4WD

    -

    Maintenance & Repair

  • Can bad fuel injectors cause a knocking noise in your engine? 1 answer

    Getting a knocking noise from my engine and the diagnostic results from my mechanic is stating bad fuel injectors causing a misfire in cylinders 4,5,8 is that possible a knocking noise could be cause...

    1997 Chevrolet C/K 1500 Cheyenne Extended Cab SB 4WD

    -

    Maintenance & Repair

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 127,452 nationwide Silverado 1500 listings starting at $1,900.

ZIP:

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 1,550
#2 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,310
#3 tenspeed
tenspeed
Reputation 1,270
View All

Related Models For Sale

Used GMC Sierra 1500"
762 Great Deals out of 49,148 listings starting at $995
Used Ford F-150"
2,539 Great Deals out of 195,108 listings starting at $1,600
Used Dodge Ram 1500"
511 Great Deals out of 13,118 listings starting at $1,995
Used Chevrolet Silverado 2500HD"
341 Great Deals out of 33,747 listings starting at $1,750
Used Toyota Tundra"
522 Great Deals out of 23,328 listings starting at $2,500
Used Toyota Tacoma"
532 Great Deals out of 25,346 listings starting at $2,490
Used Chevrolet Tahoe"
803 Great Deals out of 34,535 listings starting at $1,500
Used Ram 1500"
927 Great Deals out of 110,860 listings starting at $5,500
Used Chevrolet Colorado"
300 Great Deals out of 18,107 listings starting at $2,500
Used Chevrolet Silverado 1500HD"
18 Great Deals out of 323 listings starting at $2,999
Used Chevrolet Silverado 2500"
8 Great Deals out of 289 listings starting at $3,290
Used Chevrolet Camaro"
565 Great Deals out of 35,622 listings starting at $3,497
Used Ford F-250 Super Duty"
377 Great Deals out of 41,017 listings starting at $2,500
Used Ford Mustang"
669 Great Deals out of 41,097 listings starting at $1,500
Used Chevrolet C/K 1500"
1,170 listings starting at $2,988