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2002 Silverado 5.3 Slow start, starter or wires? #4642677
01/22/18 09:12 AM
01/22/18 09:12 AM
Joined: Aug 2009
Posts: 695
CA
Gito Offline OP
Gito  Offline OP
Joined: Aug 2009
Posts: 695
CA
Own a 2002 Chevy Silverado with 340k miles.

Been noticing a slow crank before the truck starts. At first I thought it was the battery but it was tested and its good.
Then I thought it might be the starter but since the truck has been starting fine each time and hasn't missed I thought I better look elsewhere.

Again, its a weak crank (weak start) but starts each time.
Have not checked the alternator. I figure the battery would have been dead by now if the alternator was the culprit (need to check that)

Wires? starter? battery? alternator?

Any advice is greatly appreciated

Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642683
01/22/18 09:17 AM
01/22/18 09:17 AM
Joined: Apr 2010
Posts: 4,547
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,547
Storrs, Connecticut
Have you load tested the battery? I've seen some batteries that seem to be putting out adequate voltage until load testing them. Check all wire connections and make sure they are shiny clean and tight.

If all of the above tests fine your starter might be going out. The starter in my Jeep just died a month ago. It was cranking slower and slower until one day it barely turned over. At one point my oil filter housing adapter gasket was leaking all over the starter, which I'm sure is what led to it's death.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (35k) - Castrol Edge Euro 0w40, MANN HU816X
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642687
01/22/18 09:19 AM
01/22/18 09:19 AM
Joined: May 2007
Posts: 451
South Carolina
pcoxe Offline
pcoxe  Offline
Joined: May 2007
Posts: 451
South Carolina
Check the battery terminals for corrosion, or just clean them up anyway. A small amount of resistance can drop the voltage.

Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642689
01/22/18 09:20 AM
01/22/18 09:20 AM
Joined: Feb 2009
Posts: 1,585
wv
krismoriah72 Offline
krismoriah72  Offline
Joined: Feb 2009
Posts: 1,585
wv
Either put a multimeter on your current battery or jump it with jumper cables or a jump box to rule out the battery.. My guess is that its a warning sign of your starter.

Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: pcoxe] #4642694
01/22/18 09:25 AM
01/22/18 09:25 AM
Joined: Jan 2017
Posts: 194
Michigan
64bawagon Offline
64bawagon  Offline
Joined: Jan 2017
Posts: 194
Michigan
Originally Posted By: pcoxe
Check the battery terminals for corrosion, or just clean them up anyway. A small amount of resistance can drop the voltage.


This


05 Duramax Chevy(SOLD), 64 Chevy wagon, 10 Jeep Wrangler, 17 Equinox (rental), 18 Silverado 1/2 ton
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642701
01/22/18 09:30 AM
01/22/18 09:30 AM
Joined: Oct 2014
Posts: 12,557
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 12,557
Idaho
you need to diagnose the problem,,check all the listed parts you mentioned then if they are fine check some more. It sounds like new vehicle time.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642727
01/22/18 09:56 AM
01/22/18 09:56 AM
Joined: Aug 2009
Posts: 695
CA
Gito Offline OP
Gito  Offline OP
Joined: Aug 2009
Posts: 695
CA
Father in law also drives a Silverado. Swapped out batteries a few minutes ago and my truck has same symptoms. Battery not the issue.

Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642731
01/22/18 09:59 AM
01/22/18 09:59 AM
Joined: Aug 2009
Posts: 695
CA
Gito Offline OP
Gito  Offline OP
Joined: Aug 2009
Posts: 695
CA
Going to clean the contacts and report back.

Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642752
01/22/18 10:28 AM
01/22/18 10:28 AM
Joined: Dec 2017
Posts: 417
Massachusetts
VeryNoisyPoet Offline
VeryNoisyPoet  Offline
Joined: Dec 2017
Posts: 417
Massachusetts
If battery passes a load test and battery terminals are clean and tight, the problem is elsewhere. Test the wiring between battery, starter, and block. You will need a helper and a digital multimeter for this.

Pull the fuel pump fuse while engine is idling to bleed off the fuel rail pressure. Now the engine will crank without starting but without dumping in raw fuel. Put a multimeter on the 2 volt range. Attach one meter lead to the battery positive terminal. Attach the other meter lead to the starter positive terminal post. Use the points of the probes to dig in through any dirt or corrosion to get a solid connection.

Now have your helper crank the engine for 5 seconds and watch the multimeter reading. You should see under 1 volt, preferably under 0.5 volt.

Next connect one meter lead to the starter housing, and the other to the engine block. Again dig in the points of the probes to get a good connection. Have your helper crank again for 5 seconds. There should be very little voltage drop here, under 0.1 volt.

Now check between engine block and battery negative terminal. Dig in probe points, crank for 5 sec, watch the meter. Should be less than 0.5 volts here.

If any of those tests returns a high voltage drop, there is a bad connection that is starving your starter of voltage. Solutions could be as simple as cleaning terminals at starter, at battery, and at the engine block negative connection.
Could be as invasive as cleaning between starter and block or replacing internally corroded starter positive cable or engine block negative cable.

But if those tests come back okay, and the engine still cranks sluggish, maybe there is a problem with the starter motor itself.


1998 V70 GLT / 195k miles [10w-30 Valvoline Syn w/ Maxlife Tech + Mann W917 filter]

"Use yah blinkah!"

"Be nice. The alternative involves an air horn and 7000 lumens of high beam."
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: pcoxe] #4642758
01/22/18 10:33 AM
01/22/18 10:33 AM
Joined: Sep 2015
Posts: 6,073
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,073
Kalifornia Kollective
Originally Posted By: pcoxe
Check the battery terminals for corrosion, or just clean them up anyway. A small amount of resistance can drop the voltage.


Time for new cables. The crimp ends now have crevice corrosion and I'll bet the ground point on the engine has never been touched ...

New ground cable (mostly needed) with the crimps soldered too while the wire is fresh. I'd go up a size. But that's up to you... I'd also add a >#8 fine stranded wire from Bat (-) clamp bolt to radiator support and one to alternator mount. Crimped and soldered terminals.

Remember that all the current going though a circuit has to return via ground path, but with no available voltage to drive it. So ground is mostly overlooked and is more in need of attention.

Should spin right up smile

Last edited by BrocLuno; 01/22/18 10:36 AM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642792
01/22/18 11:02 AM
01/22/18 11:02 AM
Joined: Aug 2004
Posts: 1,483
San Antonio, Texas
sasilverbullet Offline
sasilverbullet  Offline
Joined: Aug 2004
Posts: 1,483
San Antonio, Texas
What everybody said so far, once you have battery, cables, starter, connections all verified, with that many miles on the engine it might be time for a rebuild. Over the years I've noticed the ones that are ready for a rebuild will start to turn over slowly.

Hope that's not your case...


03 Porsche 911 Liqui Moly Leichtlauf High Tech 5w-40 & Mahle filter
14 Honda Accord 4dr EX-L 4cyl-M1 0W-20 & WIX XP
02 Chevy 5.7L van-GTX HM 10W-40 & WIX filter
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642800
01/22/18 11:06 AM
01/22/18 11:06 AM
Joined: Dec 2002
Posts: 1,614
North Carolina
Rat407 Offline
Rat407  Offline
Joined: Dec 2002
Posts: 1,614
North Carolina
After cleaning up all the electrical connections and vehicle grounds, the next step is to check fuel pressure at the fuel rail. You can get a gauge to use from Auto Zone. Mine didn't want to start and it turned out my fuel pump was going and the fuel pressure was low, 45psi and it is supposed to be 50spi.

What was happening is it wouldn't start on the first crank of the key but the second bump it fired right up.

Now if fires right up every time.


2002 Silverado 5.3 0w-20 AMSOIL
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642874
01/22/18 12:16 PM
01/22/18 12:16 PM
Joined: Jan 2017
Posts: 194
Michigan
64bawagon Offline
64bawagon  Offline
Joined: Jan 2017
Posts: 194
Michigan
It could also be a starter on its way out. A weak, worn out starter would have the symptom


05 Duramax Chevy(SOLD), 64 Chevy wagon, 10 Jeep Wrangler, 17 Equinox (rental), 18 Silverado 1/2 ton
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642878
01/22/18 12:21 PM
01/22/18 12:21 PM
Joined: Oct 2015
Posts: 221
KS
DerbyDave Offline
DerbyDave  Offline
Joined: Oct 2015
Posts: 221
KS
I had a Taurus that had similar symptoms. The starter was going out, I took it to OReilly's and had them hook up their electrical test equipment. The starter was drawing way more current than it should have been. I replaced the started and all was good again.


1997 Ford Taurus
2007 Honda Ridgeline
2003 Suzuki GZ250
1986 Suzuki Cavalcade
2014 Nissan LEAF (Gone)
Re: 2002 Silverado 5.3 Slow start, starter or wires? [Re: Gito] #4642885
01/22/18 12:32 PM
01/22/18 12:32 PM
Joined: Dec 2017
Posts: 51
Idaho
RonRonnster Offline
RonRonnster  Offline
Joined: Dec 2017
Posts: 51
Idaho
FWIW I've had a couple different SBC starters turn over really slowly but test out fine on the bench at the auto parts store. The first time, I chased it around everywhere - battery, terminals, cables, etc. Finally put a new starter in (even though it tested fine on the bench) and problem solved. The second time it happened, I purchased the new starter right away after the battery and cables checked out. Problem solved. My theory is that the starter tests fine on a bench with no real load. Something to consider, anyway.


- 2007 GMC Yukon XL Denali - 6.2L / 81k mi.
- 1998 Chev K1500 4x4 - 5.7L / 155k mi.
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