GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 2 of 2 FirstFirst 12
Results 11 to 16 of 16
  1. #11


    I just want to jump in here and caution anyone who uses a pressure washer to clean their engine - at least for those of us with the V8s anyway. I always assumed that as long as I kept the pressure away so that nothing was directly blasted, it wouldn't cause any problems. BUT, I rinsed my engine bay with a pressure washer on Thursday, and on Sunday I got a check engine light for a defective knock sensor. My research since then shows that apparently when you get that much water in there, it can sit below the intake manifold and corrode the knock sensors. A lot of the cases of bad knock sensors (P0332 code - only the rear knock sensor ever seems to get water damage) seem to happen a couple of days after the engine bay is washed. Sometimes it goes away, sometimes it doesn't. If my problem doesn't go away once its had a chance to dry, I'll have to replace both knock sensors and the wiring harness because I don't want to have to remove the intake again if the other one fails. The cost in that case would be about $200-$250 plus about 3 hours worth of labor... that adds up to about $500 or more total if you have a shop do it (at least in my area).

    Anyway, after all that, what I'm trying to say is just be sure to wash your engine bay carefully.

    2008 FORD F350. My new all-around truck.
    2001 Silverado Reg. Cab Not-So-Base -- SOLD
    2003 Avalanche Z71. No Cladding. Check out my Mod thread. - Crashed. Will be rebuilt soon.
    1974 Triumph Spitfire 1500 - Work in Progress
    2003 Sierra 3500 Duramax. The Newer, Better Work Truck -- FOR SALE

  2. #12


    well it sounds alot like some guys should do a nice how to, or DO and DONT section on this topic LOL
    might benefit alot of people
    2000 Chevrolet Silverado

    4.3L V6, 4L60E, 2WD, Single Cab
    Airaid CAI
    Poweraid TB Spacer
    Flowmaster 10-series exhaust (dumped)
    Edge CS insight monitor
    4.10 gears
    Limited-slip differential
    LS-1 Dual Electric fans
    Corvette tranny servo swap

    Head Unit: Alpine
    Speakers: Alpine SPR-60C 6.5" component set, 4X6 Infinity Kappas
    Subs: 2-12" Kicker CVT's
    Amps: Alpine-M1000 (subs), Alpine MRX-F65 (Speakers)

    305/70R16 NITTO Terra Grapplers
    16" PROCOMP 7089's
    2" leveling kit
    3" Fabtech Spindle Lift Kit
    Front/Rear-Bilstein 5100 shocks

    35W HID Low Beams
    RECON LED smoked roof cab lights
    HELLA LED taillights and 3rd brakelight
    HELLA FF-75 Aux. Reverse Lamps
    RIGID dually D2, flush mount, wide beam
    Hawk HPS Brake pads
    Russell braided steel brake lines
    Powerstop-red powdercoated brake calipers
    Powerslot Cryo brake rotors
    EGR in-channel window visors

  3. #13


    okay so i just sprayed out my engine bay....
    i used skippys method, seems to have been good so far, started up and didnt die...
    however, ill use simple green and rags once i replace my fuel injectors to get down to the finer cleanliness...

    quick question... i know this aint the right thread but...
    ive had some misfiring problems for a few weeks, only on cold starts, and goes away once the engine is hot, but i noticed that after doing this engine wash and driving home then, to and from an autoparts store, it seems to have amplified the stumbling/misfiring. made it misfire while my engine was actually hot...
    so are fingers pointing more towards ignition caused misfiring now??? since being wet seems to have done this?

  4. #14


    Quote Originally Posted by reggiecab2000 View Post
    okay so i just sprayed out my engine bay....
    i used skippys method, seems to have been good so far, started up and didnt die...
    Two things. Not likely getting your engine wet would cause this. You'd have to actually break electrical connection at a fuel injector or spark plug. If you're concerned you might have done that, pull the electrical connections and smear some dielectric grease on them, and reconnect. If your misfiring is still there, you likely have a different problem (This is actually what I'm leaning toward anyway, since your engine was already misfiring...)

    When was the last time you changed plugs, and did you double check the gapping on them? Over time, the plugs' gaps will widen due to wear, takes a lot of voltage to cross that gap and a few misfires only amplify that due to fouling. I'd check plugs first, then check your fuel injectors. To determine if your injectors are firing, just hold a screwdriver against them (metal end on the injector) and the handle against your hear, you'll hear the tick tick tick from the pulsing if it's firing consistently.

    Beyond that, check your fuel pressure, and replace your fuel filter, if you've got one and haven't already done so.

    2006 Vortec Max 1500
    -Custom Tune (389HP 440 Ft/lbs Trq - Dyno'd) | Volant CAI | Magnaflow Dual-in/out Exhaust w/3" stainless pipe tips | Fully Built Transmission w/ Red Eagle Clutches & Kolene Steels w/ Corvette Servos and Stage2 Shift Kit | 35K Tranny Cooler | Mobil 1 | Royal Purple Rear Diff
    -Spray-in Bed Liner
    -Premium Sound w/lifetime Satellite Radio | Leather | Sunroof | Heated Seats
    -Limbstriping from USING the truck (those are badges of honor)

  5. #15


    yes, i did those some time back, i actually created a thread about it on here recently, i was just too lazy to pop it up real quick, but nothing ignition I know of, but i will be replacing my injectors whenever they get here

  6. #16
    Master Mechanic zigger215's Avatar
    Join Date
    Sep 2011
    Fairbanks, Alaska


    Good way to test plugs and gaps, start truck, put foot on brake and gas (power brake). Apply small amount of load, if you have a plug issue, wire, plug, gap, you should here small popping and missing instead of a nice consistent groan.

Page 2 of 2 FirstFirst 12

Similar Threads

  1. Engine cleaning
    By LOVINTHESTORM in forum Detailing & Truck Care
    Replies: 3
    Last: 05-10-2012, 09:35 PM
  2. Replies: 1
    Last: 03-14-2012, 08:11 PM
  3. Engine Cleaning 1999 Silverado 2500
    By bluebrick in forum Chevy Truck Talk & GM News
    Replies: 3
    Last: 02-01-2012, 11:18 PM
  4. help with engine cleaning!!!
    By ace08 in forum General Chevy & GM Tech Questions
    Replies: 4
    Last: 03-08-2010, 04:29 PM
  5. Engine Compartment Cleaning tips anyone????
    By Prophet1990 in forum Chevy Truck Accessories
    Replies: 12
    Last: 01-05-2010, 11:37 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts