Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
OT: Car stalls at idle when hot, and then won't start
#1
I was "given" a replacement car at someone else's expense for one that was stolen from me (don't ask, it's a very convoluted story) and it seems to be in pretty decent shape except for one big problem, the car runs FINE and starts immediately when it is cold, but once the car heats up (though the temp gauge NEVER goes past half), the car starts to stall as soon as you let off the gas (especially at red lights), and gets progressively worse so that to keep it running constant gas is required and eventually it will just stall and not start again for 15-20 mins or so when it cools down.

I brought it to a mechanic today and he said he thinks the injectors are clogged and suggested trying adding a can of K44 injector cleaner (which he doesn't even sell so he has NO vested interest here) and if it clears up in 2 or 3 days replace the fuel filter and be done with it. If that doesn't work we'll see what else can be done.

Does anyone have any suggestions as to some likely culprits? Does this sound like an injector problem? And why should it only start when the car heats up (but again doesn't overheat at ALL)? It's honestly like two completely different cars, it runs without a hitch then suddenly starts to choke until it cools down and then runs fine again until it heats back up.

I am worried there might be something more serious and potentially expensive to fix, and I absolutely have NO faith or trust in the guy who gave me the car so he would have no qualms about dressing up a lemon.

I'm planning on getting the entire car checked out in the near future, but this issue is immediate as it makes it almost impossible to drive in city traffic for very long and if it is going to be an expensive fix I'll just give him the car back and demand another one.
Reply
#2
Make and Model ?

"Free" car sounds like a very complicated issue. Despite the old saw, ALWAYS look a gift horse in the mouth. Ol' Dobbin may only be suitable for the glue factory.
Reply
#3
Sounds like fuel starvation caused by a vapor lock. Need more information.
Reply
#4
Yeah, make, model, year are essential before even trying to answer your question.
Reply
#5
If it is a model that has a fuel pump in the tank (like older VW/Bosch systems) then it could be a sign of a fuel failing pump.
This is especially true if you are driving around with low fuel levels (say under 1/4 tank) In these systems the fuel in the tank
acts as a heat sink for the fuel pump. Either way I would have the mechanic check fuel pressure and replace filters before
I replaced injectors. Can't hurt to try cleaner though.
Reply
#6
Spock wrote:
Sounds like fuel starvation caused by a vapor lock. Need more information.

That was my first thought. I don't think you get vapor lock on FI systems, though.
Reply
#7
Z wrote:
Yeah, make, model, year are essential before even trying to answer your question.

Agreed.
Reply
#8
Vacuum problem. Crack/poor seal in a manifold.
Reply
#9
fuel flow
MAF or any number of sensors, though they should show up in codes
EGR ?

not so sure a filter would cause a stall at idle as fuel flow should be low then but filters do weird things
Reply
#10
Ambiant temperature sensor. Some cars have two temperature sensors. The first will adjust fuel mixture to temperature of engine and outside temp. If one of these fail, computer doesn't adjust the fuel ratio correctly when engine hot. Try Autozone, they will check codes for free and sell you the right one.
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)