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  1. Matthew Jeschke

    Aftermarket fuse and relay junction block

    I desperately need some sort of aftermarket fuse junction block. It should be weather sealed. I've been tracking gremlins in my fuel system. The pump has intermittent performance. I tracked it down to overheating relays and fuse block under the hood. My fuel pump is aftermarket which runs at 11...
  2. Matthew Jeschke

    Aftermarket fuel pump failure?

    I HAVE to know EXACTLY what failed on my truck so it won't happen again and strand me in a remote location of the mountains I use my truck in. Any additional thoughts are appreciated! Symptom: failure #1 driving slow speed (low power) for some time. Engine leaned out and stalled. Waited one...
  3. Matthew Jeschke

    Best hose pinch clamp for fuel line?

    Ah H E double hockey stick! I broke down. First time EVER I've been unable to get my vehicle to move again and had to call a tow truck. Lost fuel to engine, my wideband would fire up at 15:1 then quickly go to 20:1 and engine would stall. Probably surfaced yesterday where it stalled on a...
  4. Matthew Jeschke

    3800 cooling system from HELL

    I'm to the point where I am ready to put in some sort of stop leak in my cooling system. A friend recommended silver solder but I don't thing they make that anymore? Anybody have a good stop leak they recommend for a cooling system. Backstory: I got this 2006 Buick Lucerne nearly 10 years ago...
  5. Matthew Jeschke

    What type of metal is the exhaust?

    I am curious what type of metal is the exhaust on my truck (2001 chevy tahoe)? I assumed it's stainless... but what grade? I need to know what welding wire will work with it. I welded my exhaust a few times broke every time. My neighbor sold me a once used welder, helmet, gloves, etc. It's the...
  6. Matthew Jeschke

    Reworking harness for high volume Fuel Pump

    I have a separate post on fuel pump pressure. Finally bit the bullet and bought a high volume fuel pump for my build. Hopefully helps with fuel issues. Long story short... I need to figure out what terminal pins are used in the fuel pump connector. I have the pins for the under hood junction...
  7. Matthew Jeschke

    2005 Saturn L300 CV Axles

    I have a friend that needs to replace these. I might do the job for him however, he said shop says it requires a special tool. I cannot find much info on this vehicle online to verify that... Anybody have any additional info? Here's a link to the part...
  8. Matthew Jeschke

    Depinning and repining circuit in underhold relay box

    I am installing a new high flow fuel pump. Separate post. Called manufacturer and they recommend 20 amp fuse w/ 12 gauge wire. Current circuit has 18 gauge wire (1 according to wiring diagram?) and a 20 amp fuse. I need to open the harness and run 12 gauge wire to pump. However, I'm unsure what...
  9. Matthew Jeschke

    Dimensions of fuel pump motor

    I have a brand new fuel pump assembly and sending unit. Pump motor is garbage. I've decided I'll swap in a good aftermarket pump from AEM, Holley or another reputable brand. However, I don't have the dimensions of the basket or pump itself to know which motor will fit. I called AEM and they...
  10. Matthew Jeschke

    Lost TCC control signal?

    I am on a road trip and got DTC P0741 TCC stuck off. I have a bidirectional scan tool with me. I can command the TCC on just fine but for some odd reason the computer will not turn it on itself. Any ideas gas mileage is horrendous without the torque convert clutch locking up. Thanks!
  11. Matthew Jeschke

    Trans cooler line set management (it rubs!)

    I did a quick repair and noticed my trans cooler lines are interfering with the idler arm! Granted I modified my trans cooling system to install a thermal bypass as well as 40k trucool cooler. However, I was VERY VERY careful to maintain the original / factory line set management. I don't think...
  12. Matthew Jeschke

    Trying 285/70R17... Load C any good?

    I am going to give away one of my best kept secrets. I got $370 for four used KO2 tires mounted and balanced. They look snazzy, have around 1/3 ~ 1/2 the tread left. Not too bad as is a little over the price of ONE tire new NOT mounted. Only thing is I try to get them w/in 3 or 4 years of age...
  13. Matthew Jeschke

    Incorrect fuel pressure Key on and Engine Running

    I'm moving this from another thread. My fuel mileage has been suffering for quite some time and I think this is contributing factor. I honestly, only really know basics of troubleshooting fuel pressure. Maybe this is operating correctly, or maybe not? Vacuum Check: I did a sanity check, revved...
  14. Matthew Jeschke

    Best flex brake lines?

    My truck chassis has 270,000 miles on it. I think it's time to go through the brake system and start upgrade and replacing parts as preventative maintenance. My first item to attack will be the flex lines. I see there's multiple companies out there but not really sure what is "marketing hype"...
  15. Matthew Jeschke

    Aftermarket Intake trouble shooting MPG

    Bit of a long story, I went from 15MPG down to 12.5MPG. Did a few changes to tune, fixed evap issues, etc. Reverting tune seemed to have a limited effect on MPG. Last thing on my list seems to be the intake. I called the company. They were very responsive and tried to answer my questions but...
  16. Matthew Jeschke

    Normal AC clutch function?

    I've went through and rebuilt my AC system w/ new compressor & clutch, evap coil, etc etc. etc. It works like a champ. So far as I know (but didn't write down) AC pressures are in line, EVAP split & Condenser temp splits are good too. However, I've never really had anybody answer this question...
  17. Matthew Jeschke

    2001 Chevy Tahoe Wiring Harness

    My harness is starting to have issues. Evap is doing weird things. Also when I'm tuning data I notice the Wideband won't read same as PCM unless I tie the grounds together. I think it maybe time to get a new engine wiring harness. Anybody know a good deal for decent quality? I see them all over...
  18. Matthew Jeschke

    Cleaning Catalytic Converters

    I got a small project with a friend. He is throwing catalectic converter code P420, if memory serves me right. His symptoms also seem to align with a plugged cat. Not sure we want to delete them as I've found backpressure is highly tuned on modern vehicles. I got WAY worse power and gas mileage...
  19. Matthew Jeschke

    PCM delivering wrong fuel mixture?

    This has been extremely difficult to track down. My truck is starting to get horrible mileage. I am building it and changing quite a few things along the way. I had issues with the evap and thought that might be it too. I revered my tuning changes to a point where I knew I had better mileage. I...
  20. Matthew Jeschke

    Tool to make quick disconnect flare on metal hose?

    I bought that big trans cooler from trucool. It works AWESOME, but fits like $heet. A guy makes a metal bracket to mount it which is most of the job but needs spaced out from core support as ambient air sensor rubs on condenser and the trans lines fit like CRAP. You have to tweak the trans...
  21. Matthew Jeschke

    Reinforce upper core support mount (fender)

    I need to come up with a unique way to reinforce the upper core support mount. It currently ties into the fender but I've wrecked a fender already. I go off road, and might have been I didn't tighten up the bolt? Not sure, but I started to hear a noise, thought it was the dash but it was the...
  22. Matthew Jeschke

    Aluminium vrs steel driveshaft

    My 2001 Tahoe setup has a steel driveshaft. I've been curious why GM / Chevy switched to Aluminium. I'd think they'd break easier? I see claims they make better gas mileage but wouldn't that be EXTREMELY minimal. Like a 1/10 of a MPG maybe? They are lighter but all the mass is near the center...
  23. Matthew Jeschke

    Can you identify these fuel tank parts?

    I posted about this in a different thread on changing my fuel pump... A while ago I dropped my tank to change the fuel pump. Well I get a gas smell occasionally. I think it's really the PCM delivering too rich a mixture (separate issue). However, I did go through the evap system and manage to...
  24. Matthew Jeschke

    Bleeping QD lines to evap / fuel system

    I've done some work to my Evap system. Truck occasionally wreaks of fuel though so I'm back into it. I've replaced everything except the lines (I think are good) and canister. I just pulled the canister to test it. All besides the point, these...
  25. Matthew Jeschke

    PCM chassis grounding locations?

    I have a pinout for the PCM but curious if anybody knows which chassis grounds are closes the PCM / tied into the PCM. As well as the Aux power. Backstory: I tuned my truck. Wired up wideband and ran it off aux power with Cigarette power adapter. I noticed when the watching the wideband w/o...

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