Thanks bernd!!
If only you could find a way to make about 100,000 miles dissaper from my
truck!! :)
-- Gary Hedlin President Hedlin Web Designs http://www.hedlin.net ""Bernd D. Ratsch"" <bernd@texas.net> wrote in message news:000001c322e7$0197c820$090aa8c0@homenet.com... > > One thing I forgot to point out: > > On initial startup (and even after a cool-down period), the engine will > run a little bit rough due to the warm-up cycle on the O2 sensor(s). > This is normal (takes about 2-3 minutes max)...the lean-out "pop" was > not. > > - Bernd > > -----Original Message----- > From: owner-dakota-truck@bent.twistedbits.net > [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bernd D. > Ratsch > Sent: Sunday, May 25, 2003 11:49 AM > To: dakota-truck@dakota-truck.net > Subject: DML: Cold-Start Hesitation - Finally Fixed > > > After going through a lot of different options and tests, I finally > found the cold-start (rough running) problem on the truck. > > I know a few others have had this same problem and it could also be a > fix for you...but you'll need to check first. > > Problem: > On initial (early AM startup), the engine runs rather rough (like it's > got some sort of huge cam in it) and back-fires through the intake. Went > through TPS, MAP, O2, IAT, and a few other options as well (including > fuel sync and distributor alignment). Everything checked out fine and > well within spec. > > Solution: > Coolant Temp Sensor was off by 4K ohm (lower than normal) causing a > leanout condition. Remember, the CTS also works like the old chokes on > carbureted engines (engine warm-up). Early AM CTS resistance should be > about 9.4-9.8K ohm for my area (74-78 degrees F). Sensor was at 5.7K > ohm...this equates to 104 degrees at cold-start (not good). PCM thought > engine was warmer than actual temp and was leaning out the fuel a little > early. > > No more backfire or lean-out condition. > > - Bernd > > > >
This archive was generated by hypermail 2b29 : Fri Feb 06 2004 - 11:46:21 EST