Hello all,
Here is the problem I'm experiencing with my 1997 12-valve with 84,000 miles. When the truck is cold, it'll turn over, start to run (at about 400 RPMs), then die. So I have to crank it and add just a little throttle and hold it for a second or two, which keeps it from stalling. After holding a little throttle, the truck idles around 500 or 600. After a few minutes of run time, the idle increases and eventually settles in around 700 or 800 RPMs. Please keep in mind that these RPM figures are by the stock tach, so they're probably not too accurate. Anyway, after doing some reading here, I figured I should turn up the low idle. Well I did, which really helped out the cold start-ups a great deal. However, after a few minutes of warming-up, the idle would be at about 1000, which is too high. If I put it in Drive, the truck would easily travel at 10 MPH, which is no good IMO. The next thing I did was, with the engine at running temp, I lowered the idle just a little, so that the RPMs were around 800 again (tach RPMs). The problem is that on this setting, the truck won't start-up cold without giving it a little throttle while cranking.
I'm the 3rd owner and never met the previous owners, so I have no idea what types of services have been performed on this truck. Could it be pump timing? A pump on the way out? Any help would be great.
Thanks
Ryan
Here is the problem I'm experiencing with my 1997 12-valve with 84,000 miles. When the truck is cold, it'll turn over, start to run (at about 400 RPMs), then die. So I have to crank it and add just a little throttle and hold it for a second or two, which keeps it from stalling. After holding a little throttle, the truck idles around 500 or 600. After a few minutes of run time, the idle increases and eventually settles in around 700 or 800 RPMs. Please keep in mind that these RPM figures are by the stock tach, so they're probably not too accurate. Anyway, after doing some reading here, I figured I should turn up the low idle. Well I did, which really helped out the cold start-ups a great deal. However, after a few minutes of warming-up, the idle would be at about 1000, which is too high. If I put it in Drive, the truck would easily travel at 10 MPH, which is no good IMO. The next thing I did was, with the engine at running temp, I lowered the idle just a little, so that the RPMs were around 800 again (tach RPMs). The problem is that on this setting, the truck won't start-up cold without giving it a little throttle while cranking.
I'm the 3rd owner and never met the previous owners, so I have no idea what types of services have been performed on this truck. Could it be pump timing? A pump on the way out? Any help would be great.
Thanks
Ryan