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Update on the data: a) So in a previous comment I referenced 150F on the dash... basically, this was the first small 'bar' above the larger mid 'bar' on the gauge, but I checked it against the ELM and the elm was indicating 88-89 C (194F) at this point. So basically, the dash gauge seems...

From the previous work and data I collected using the ELM, the warmed engine was holding steady at 194 F, not sure which PID this was offhand, would have to rerun to confirm. (While the radiator was just flushed, we didnt take tremendous care on the mix ratio, we just approximated since we...

A little bit more data: a) checked fuel rail. Pressure charged is 53-53.5 psi, after 5 minutes off 52 psi, after 10 minutes off 51 psi. Stopped after 10 minutes. b) sprayed carb cleaner all over the place again on cold engine...nothing c) pulled the radiator cap and watched response...

so a followup question on the misfires.. Is it possible for the scanner to indicate 0 misfires across all cylinders but not be an exactly accurate representation of realiy? in other words, ..can i strictly believe the scanner...is it absolutely definitive? if it is 100% reliable, then doesnt...

One other comment, maybe someone can clarify, it was suggested to clean the IAC..does the IAC have any influence on performance away from idle?? Since the MPG is low, about 25%, (11 MPG actual vs 14 MPG expected) it would seem roughness at idle is really just a symptom, but not a...

yea, did a pressure test on it already. There was a rotted Y-connector in the coolant lines giving an external leak at the time, so we swapped that out, flushed and refilled and did a pressure test at that time, looked fine.... gearing up now to go do some followup testing

Belt not squeeling... yea, in the mnt notes, basically they finally addressed some core alignment issue and replaced the belt with a Gatorback (under warranty) and I guess the issue went away. Before my time obviously.. I will check fuel pressure stability tomorrow... As noted previously, I...

I have a new IAC on order as backup, seems like alot easier than all the cleaning. But will tackle cleaning the throttle body and current IAC this weekend... I also posted summary of the historic mnt records: Miles Date Maintenance 100959 Radiator...

Getting some vibration, very slight shudder at idle on a recently acquired 99 LT, unknown history other than mnt records, which show it was getting hot a few years back, getting 11 MPG in city. So far: a) I probed plug wires, didnt quantify drop, but seems each plug responded, b) was...

I am wanting to a do a cylinder power distribution test on a 99 LT with a 5.7 L in it. I am specifically wanting to use a scan tool and just toggle on/off each cylinder and watch the RPM response, as a first step. Does anyone know if any of the really cheap ELM327 devices can do this...

Solved: this morning I tried the jumper approach on pins 4 and 8. Worked like a charm...

I have a 1999 LT. Currently trying to debug remote control access. I have no history on the vehicle, but the current status is I am seeing SOME locking/unlocking action through the drivers and passengers door control panels. I say some because most of the actuators are not working and all...

Well...last posting here.. couldnt figure out what had happened. But the people I gave the vehicle too said water in the engine. It came to me last night...Now I know what happened..I forgot to purge the coolant line after reconnecting it. I had disconnected it to make removal of the upper...

Well, i started driving down the road, got about 1/4 mile and all hell started breaking loose. Sounded like broken parts inside the engine...it was a complete disaster.. i basically had to stop immediately...got it towed back and believe it or not..donated it to someone after stuffing about...

reassembled everything, still have that extra bracket and a few extra nuts, but vehicle running smoothly. Fired it up, got an extra P102 code, and had the P0300 from before, so just cleared it all out and seems to be running quite smoothly. The only thing I noticed is, while parked, with...

Ok, here is the latest on the tahoe. My approach on dissassembly was to a) leave the a/c compressor in place, b) remove all the plug wires and cap and rotor) as i was replacing it all anyway, but seems really only need to remove the plugs off the cap for the first bank, in order to get at the...

Yea, it was a cold engine and dry test. Injector out, old style central port, very wet inside manifold, alot of the injector tips were quite dirty, not really the poppets themselves, but around the tips of the poppets alot of buildup. Didnt see anything broken. Have acdelco cap/rotor on...

I did a compression test earlier , was getting 150 across all 8 cylinders. I got the fuel rail disconnected and the hold down bolt undone. Everything is loose now. I just need to pull the fuel rails out of the top of the manifold. They are in there pretty good. I sprayed it with wd40 and will...

I started pulling it all apart. Last thing holding the intake and cover on is the fuel rail and one 10mm bolt under it. Having some difficulty with it. Seems like the bottom portion is screwed into the top. Any particularly trick here. Is this a normal righty tighty, lefty loosey pair...

Also, I am thinking about replacing the cap and rotor (and maybe the wires also as they are original, but Im sure its not the wires) as well as the spider injector to multiport. Do you have suggestions as to which brand is good and similarly which brands to avoid?