Near stall in heavy rain

Discussion in 'V8 Discussion' started by GEN 3 SHO FAN, Aug 20, 2018.

  1. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    We had a lot of rain one night this weekend and I was forced to go to shopping center for an urgent need.

    I rarely saw as rain as this time. At some places on highway, I rolled on 2 inches of water at 50 mph.

    Some minutes later on a red light, the rpm goes very low reaching 200-300 rpms and menacing of stalling what I didn't really want this in the middle of the road, at night and moreover in heavy rain... I put the floorshifter into "P" and the rpm gone to 700-800.

    Since I bought the car, it never see as much water. I'm wondering if it can be an electric trouble or the engine just "eat" to much water into the intake ?

    As the car seems normal in the next days, I judge then it's not a emergency troubleshot but thanks for the info.
     
  2. stephen newberg

    stephen newberg Moderator Staff Member

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    Do you have some form of porterized intake?

    pax, smn
     
  3. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    I retreived the saxocone, I put the Gen 4 air box and I porterized the surge tank but not a lot.

    Why ?
     
  4. stephen newberg

    stephen newberg Moderator Staff Member

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    Just curious. Sometimes some water can work its way into the inner wheel well when it is very, very wet out, and that might go from there into your intake, causing the problem. That is just a guess, though.

    pax, smn
     
  5. stephen newberg

    stephen newberg Moderator Staff Member

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    Of course, look at it the positive way. You do not have a Tesla Model 3 where the entire bumper just falls off when it rains hard. ;)

    pax, smn
     
  6. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Hope to have a Tesla someday but listening to the critics, it will not be a 3... Some Porsche are interesting too.

    I forgot to mention that I have no power loss when the light turned green. Maybe the old IAC valve didn't like to drink some water...

    Same thing for some people I know... :)
     
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  7. stephen newberg

    stephen newberg Moderator Staff Member

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    I drove an S just to try it. Fun with the 'ludicrous' button, but it really does not handle all that well. I personally would avoid getting a Tesla, though I like the idea of electric cars. Tesla still loses thousands of dollars on every car it sells, and I have doubts about the long term viability of the firm, which brings into question spare parts if you plan to keep it for any length of time. Most of the car firms are working on various forms of electric cars these days, and if you want one, I would suggest waiting for it from a company that is more likely to still be around 10 years later, assuming, of course, that you intend to keep the car long term.

    pax, smn

    PS: to get the both of both worlds, I think that Porsche is planning to have what will basically be an electric 911 out in a few years. It could be the one to go for. :)
     
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  8. 98SF19

    98SF19 AlphaKennyBuddy

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    The SAI pulls from down low.
     
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  9. Tim Brand

    Tim Brand Member

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    Don't really no to much on the gen 3 but it's possible that you have a small crack in one of the coil packs. I had a similar situation on my gen 1 even time it rained it would want to die or barley stay running at times replaced the coil pack which on the gen 1 and 2 is just a block not sure if 3rd Gen has separate coil packs for each cylinder or not. Worth a look if it happens again when it rains out.
     
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  10. luigisho

    luigisho SHO Member

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    Individual coil on plug on GenIII
     
  11. 98SF19

    98SF19 AlphaKennyBuddy

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    Not sure exactly how EGR factors in, but if water gets up into SAI, it would either get into EGR lines or out through exhaust, where it would wet the cat substrate and play havoc with O2 sensors.
     
  12. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Thanks guys, good comments !

    SAI pump is takes his air down below in fact but it put air into the exhaust manifolds, not in the intake... (Which will not disturb rpm as I know.) My O2 sensors are all unpluged right now because I contamined them some years ago. (News are on the way.)

    But a crack on one of my old 4 originals front coils can be the culprit... I will check at them.
     
  13. 99sho-time

    99sho-time SHO Member

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    it's kinda weird we havn't had much rain but its been a really humid rainy 2 days and mines acting more stally'ish i don't know why. new coils to
     
  14. Tim Brand

    Tim Brand Member

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    Are your plug wires new?
     
  15. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    (We don't have plug wires on the V8, but thanks.) With four old coils on front with possibles craks, I found maybe an utility to the vanity cover in protecting coil from water (which is actually retreived).

    99sho-time : What do you have as intake settup ? A cone filter in the fender ?

    I'm wondering if the IAC valve doesn't like water. I still have the air box with a tube going in the upper part of the fender. But with all the water this night, I think some was able to reach the tube and the paper filter in the box. If this filter is going wet, it will probably permit a lot less air to pass too. (?)
     
  16. 99sho-time

    99sho-time SHO Member

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    I have a k&n cone filter thats boxed in well with a dryer duct ramming air from down below I usually run the hood adjustment screws high as possible and no hood seal( when there no rain) . But I doubt its water getting into the intake . no amount of negligible water will make it to the cats its just to hot. it would have to be a ton of water.

    for me ive always had a decell stalling attitude on my car i have no idea wtf it is i can't tell if its tranny , electrical or engine related. but my beahavior is worse in the rain which really makes me think i should check more wiring on the car specifically the driver side loom that runs over the wheel. as if i didnt have enough wiring nightmare.

    I have a noisy ground when I use the power locks on the driver side that buzzes through the radio. If have a tape in the deck and its being used I hear a whining noise. not sure what that means i have no idea if anyone can chim in.

    lasty I;m pretty sure with high confidence that my main timing chain tensioner is broken. and this is off topic. I believe its fine at higher rpm's soley because theres more oil pushing into it. at lower RPM's the timing chain wins the fight against the guide because the auto adjuster in mine is likely shredded. I have a whole timing set in my drawer which ive studied it was from a healthy motor. i can tell that the auto adjuster prevents the guide from fully compressing the tensioner i can see the by the wear marks that adjuster touches the guide. there is also a check ball valve in all our chain tensioners which fail. Im sure some may say well duh but im still learning.
     
  17. luigisho

    luigisho SHO Member

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    It's been a long time since I had my GenIII but we do get torrential rain over here and I think I remember maybe having a little issue with electric/ignition in driving in deeper water and thought it was associated with the alternator sitting so low. Maybe
     
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  18. 99sho-time

    99sho-time SHO Member

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    that's actually a good point i didnt think of that . damn thing sits very low.

    I remember one time I cleaned my alternator out with electronica parts cleaner i just drenched and watched a bunch of garbage wash out of it
     
    Last edited: Sep 10, 2018
  19. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Good point effectively but I was thinking if Alt going wrong it will cause electrical troubles/gremlins not a power loss on idle. Who knows what a bad ground can makes...

    I don't have to roll in heavy rain since but I unbolted my front coils and they have severe cracks on 2 of them (I kept my old motorcraft for the front bank as they are easy to change). I replaced them by good old motorcraft and the idle is better too (enough to stress me a little on red lights as the motor runs very smooth).

    Thanks all for the advices. :)
     

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