Best way to set timing on 99 5.7 Suburban ? When lining timing marks do I leave distributor in but lose or pull distributor completely out?


Asked by Feb 15, 2015 at 11:10 AM about the 1999 Chevrolet Suburban K1500 LS 4WD

Question type: Maintenance & Repair

6 Answers


6 out of 6 people think this is helpful.

Here is the key part: For the V8 5.7L-- After setting distributor, Then connect a scan tool. Monitor the Camshaft Retard Offset value. Important: If the Malfunction Indicator lamp is turned on after installing the distributor, and a DTC P1345 is found, the distributor has been installed incorrectly

4 out of 4 people think this is helpful.

While looking I found this post by Tom, the Tom that is the all-time heavyweight undisputed champion points leader here, and deservedly so, Just substitute Suburban for Tahoe, it's the identical 5.7L engine: "In the Tahoe the distributor does not control timing. It controls the synchronization of the cam sensor and the crank sensor. The only way to set it accurately is with a class 2 scan tool. There will be a PID in data for cam/crank offset. The distributor has to be turned until this reads 0. Any more than 4 degrees off and it will set a P1345 code and run rough." End quote

4 out of 4 people think this is helpful.
Annette Chandler

thats what i was meaning relearn cam /crank sensor without scan tool

2 out of 2 people think this is helpful.
Andrew Olsen

Don't turn the motor with the dist out or you will miss align the oil pump shaft. There isn't a way to do it without a scan tool unless you mark it before you pull it out and line it back up the exact same way.

2 out of 2 people think this is helpful.

Teeny bit of misinformation here . . . First of all, there is a way to do this with an affordable scanner that just clears codes, and secondly, a P1345 code does not always indicate an improperly installed distributor, so try a couple things before you start yanking your distributor. It could just be 8-10 degrees off. Anything more than +/- 2 degrees from spec will trip the code. If you don't want to buy the $1000 2-way scanner, or don't want to pay a mechanic $250 to do this adjustment, here is what I did. Old school. You will need a scanner that can at least clear codes. Get the blue-tooth scanner/adapter (amazon) and pay the $2.99 for the "torque" app (the free one is lame) and you can get some basic real time info and reset codes etc. all for way under $25. First of all, if your distributor is 180 out, or a tooth or 2 off it won't run for shit or at all, and is another whole post. So let's focus on this specific situation: Reasonably installed distributor, running well, still throwing the 1645 code. Clear the code. Start the truck. Start a timer to see how long before the code is thrown. 4-6 seconds equals too far advanced. Loosen the hold down. Back it off 2-4 degrees at a time, repeating the code clearing/restart procedure. You will quickly find that there is a correlation between the quickness the code is thrown and how far advanced it is. As you back off and restart, it will take longer to throw the code (ie 8-12, 12-16 seconds) then voila, you will find the sweet spot. If I had the $1000 snapon scanner, I would be able to rotate the distributor in real time @ 1000 RPM and get it into spec (within -2 to 0 degrees I think). The above took me 15 minutes and now the 1645 code is gone forever. On down the road!

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions


Looking for a Used Suburban in your area?

CarGurus has 24,186 nationwide Suburban listings starting at $1,500.


Search Chevrolet Suburban Questions

Chevrolet Suburban Experts

#1 Eric Fritz
Eric Fritz
Reputation 800
#1 Andrew Olsen
Andrew Olsen
Reputation 800
#3 Neal Turner
Neal Turner
Reputation 710
View All

Related Models For Sale

Used Chevrolet Tahoe"
1,105 Great Deals out of 36,356 listings starting at $1,700
Used GMC Yukon XL"
205 Great Deals out of 6,710 listings starting at $2,575
Used Ford Expedition"
580 Great Deals out of 21,509 listings starting at $2,111
Used GMC Yukon"
537 Great Deals out of 14,693 listings starting at $1,500
Used Cadillac Escalade"
376 Great Deals out of 11,252 listings starting at $2,999
Used Chevrolet Silverado 1500"
2,429 Great Deals out of 144,008 listings starting at $1,995
Used GMC Yukon Denali"
26 Great Deals out of 4,665 listings starting at $7,995
Used GMC Suburban"
219 listings starting at $1,595
Used Lincoln Navigator"
143 Great Deals out of 6,078 listings starting at $1,999
Used Ford F-150"
3,161 Great Deals out of 216,444 listings starting at $1,000
Used Ford Excursion"
16 Great Deals out of 867 listings starting at $3,995

Used Cars For Sale

2017 Chevrolet Suburban For Sale
1,359 listings starting at $42,610
2016 Chevrolet Suburban For Sale
55 Great Deals out of 9,964 listings starting at $36,999
2015 Chevrolet Suburban For Sale
136 Great Deals out of 2,990 listings starting at $29,900
2014 Chevrolet Suburban For Sale
26 Great Deals out of 509 listings starting at $19,977
2013 Chevrolet Suburban For Sale
68 Great Deals out of 1,052 listings starting at $15,998