Early '99 Crew Cab 7.3PS 4X2
192K miles. All stock...
Originally started out what seemed to be a cold start issue....In the morning, it normally be a bit sluggish. 1 in 10 it would romp. Only died once in about 4 months since I had it. Sometimes it would be fine. As I got about 5 miles down the road...it would warm up and run fine.
Gene ran the codes for me along with a contribution and buzz test. No codes, buzz test was fine. Contribution showed low on 8 the first time....then low on 5 and 8 the second. Recommendation was a look at the IPR
I pulled the IPR
, looked fine....cleaned it anyway. Put it back, no change.
About a month ago, cold start, jumped on the highway for about 3 miles, went up an on-ramp and as the lockup disengaged the RPMs dropped right to zero. Waited 15 seconds, truck started up and no more problems.
Two days later I was driving up the highway and I head a distinct change in tone....it sounded like knock.
When I stopped, truck was missing badly...felt like a gasser with a HUGE Cam and a nasty lope. When I gave it throttle, it couldn't feel it.
I've replaced the oil, fuel filter (bowl was pretty nasty), GP relay, CPS
(which resulted in a failure of the Tension assembly and Serpentine belt....now both new). GP's have all been ohmed and look good.....I haven't had it romp in quite some time....but it will idle crappy in warm or cold weather when I start it.
I've tried using an IR gun to see if one of the holes wasn't firing....but each runner seemed to be about the same temp (around 270deg).
Worst of all....problem is completely intermittent. I fired up the truck this afternoon after not running it for a couple weeks and it felt pretty smooth. No miss. No knock. WTF?
By the way....Why do Autozone and Kragen both tell me my serpentine should be a 1215 (121.5") instead of the 1223 (122.7") that actually fits? A little online research seems to indicate the 1215s were indeed for the 99 and 00 trucks....why does mine need a 1223?