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Sounds wiring\connector related to me - the trans codes result from the lower harness to the trans - the DS4 code results from the engine harness, both connectored to the main PCM harness back there on the firewall behind the fuel manager cannister - look for frayed\bare\oxidized\corroded

Correct, as OBD1 will also relearn any IP offset change within that period - the statement was intended as humor, but with a point: while not many people are gonna take 50 tries to get the timing adjusted in TIMESET before doing TDCO LEARN, don't dawdle - if the last setting was out of spec when...

The '99 PCM's were revised a little from the previous years, so that fuelrate is right for your year truck - the '99^ oem tune is the best of the lot FYI: you really need to stop and write down exactly what occurs when you're testing, or your input becomes unreliable and untrustworthy - no...

There are many chips for each IP, depending on body\chassis\drivetrain configuration - BNTF is a valid checksum for a 3500drw chassis - I sent one to BH exchange for his first hi-output chip for my truck - I used the manual transmission chip with my T400 to eliminate the 4L80E DTC's Again, the...

TDCO limits are +2.50* to -2.50*, as I stated Also, as I stated, DTC limit is ~ -2.20* for OBD2, less for OBD1 The consensus of moderator opinion, Buddy, is that you need to a - commit the posted DS4 timing procedure to memory - it is correct in scope and intent, performed with a new...

Or, TDC for #6 - 1-8-7-2-6-5-4-3 - which it would be with IP gear-mark at BDC..............

It is 3.5* ACTUAL, and 0* DESIRED, Leo - PCM disables DESIRED under the timing commands altho the DESIRED numbers are still there TDCO LEARN or KOKO is entirely "3 bolts of the IP dependent" at idle - read the sticky TDCO thread again(?) for enlightenment - I've even explained the...

This was marketed by an oriental-sounding eBay'er a while back, who claimed to come from a long line of engineers...........prolly meaning he was born 9mos after a big engineering convention in his home-town............................

Wasn't advertised improperly, was nobody could afford it - Horton's ain't cheap..............

Likely they both need timing with a scantool - you could start by verifying each ESO is exactly vertical to horizontal plane across valve covers - that should be within a gnat's ankle of +3.5*BTDC IP timing, which should start and run - that is, if he correctly timed the pumps to the cam-gear

The procedure eliminates having two (count'em: 1) timing marks on the cam gear - still don't make sense to me, but I am dyslexic, whereby S designed the DB2 and DS4 for another manufacturer, not Detroit Diesel, so we get the peculiar mechanical timing sequence that fits the timing chainset...

Well, it's 98 outside in the shade, and humid - even the cicada's have cut back to an idle..............

What difference does it make? Powerstroke is a Ford Align the cam-sprocket mark at 6 to the crank-sprocket mark at 12 Rotate the crank 360* so the cam-gear mark is at 12 Align the IP-gear at 6 to the cam-gear at 12 All aligned = all timed

I am impressed........................

Still not getting it, Buddy: - very important in your case, aftermarket tunes are not always totally compatible with oem versions - reinstall your oem chip, run your tests for base comparison - that's the only way you'll get a handle on what's actually happening in these timing procedures -...

Get the IP #'s off the labels, also noting the label color: black, blue, red, etc - DS4-xxx-xxxx - post the year and series\gvwr for each #

OBD2 timing procedures for oem factory tune* - results may vary with aftermarket tunes - Bill Heath's tunes respond normally to scantools All DTC's must be cleared prior to performing Timing and TDCO procedures - OBD2 DTC's require a scantool I compared procedures using a new TECH2 and...

OBD1 timing procedures for oem factory tune* - results may vary with aftermarket tunes - Bill Heath's tunes respond normally with scantools (courtesy of member Turbovanman) All DTC's must be cleared prior to performing Timing and TDCO procedures To clear your OBD1 DTC's, put a wire jumper...