-
Engine rev when in park
When I fire up the car and it is in park the engine starts revving. From about 5 to 15. The lower it drops the higher it revs.
Sounds like someone is pushing the gas pedal then letting off constantly...the fuel pump would also run for about a minute and if you tried to start the car before it shut off, it wouldn't start.
A friend said to change the rpm relay...which I did...and the problem stopped for about 2 weeks...now its doing it again.
Fuel pump cuts off after a couple seconds and the car starts, but just revs
Any one else had this issue?
mike
-
I don't think you are describing the problem well. With your foot off the throttle pedal and the pedal all the way to idle, and the car in Park, you say it revs up and down by itself? Then you are saying you have a problem with the fuel pump and a 3rd problem with starting it. To begin, you have an automatic and does it still have the K-Jet fuel system? Has it ever run right? What have you done to it besides the RPM relay?
-
Okay I will describe it better...
When I start the car, after it is sitting idle in park for about a minute, the rpms start fluctuating between 5 and 15 if it drops below 5 it jumps to like 20. It does this constantly...like someone is just revving the motor...I can try and take a video tomorrow.
But as stated I was told the rpm idle relay needed replacing, which solved the problem for a week or so. But now its back. It is the original motor but has been rebuilt.
-
That's called "Hunting"
A very common DeLorean...erm....characteristic? Its very normal.
Let the car warm up and see if it stops. The car needs to warm up and idle hunting should cease for the most part.
EDIT-: Also, the exhaust system has an "Open" & "Closed" loop system, which adds to the hunting idle you are experiencing. Maybe another member can explain it better, but essentially the system has to warm up, thus, open loop. Once its warmed up, it falls into a closed loop. Its weird and hard for me to describe. You can take a video of what youre experiencing, but I'm pretty sure its what I stated above.
-
-
Reving when cold without touching the throttle is normal, racing from 500 to 1500 is a lot but not terrible. It should level out to a much smaller amount quickly. How is it once the motor warms up?
-
https://www.youtube.com/watch?v=WR8VEriaxpQ
This is NOT a video of my car... but it is exactly what mine does...
I will fire it up today and let it run longer till warmed up and see what happens.
Thanks guys
-
The surge is a symptom of incorrect base fuel mixture/ incorrect control pressure or idle control.
See post 19 in:
http://dmctalk.org/showthread.php?15...umpiness/page2
Before:
https://youtu.be/oXy4y5Cpa0s
After:
https://youtu.be/Glh_TaTSP1A
-
Cost of mechanical fuel injection i.e. K-Jet. Mine behaved exactly as you described for years. No real danger, but stalling when approaching red lights got me to go EFI, i.e. electronic fuel injection.
Think of trying to mechanically mimic a Segway (or "hoverboard" these days), rather than with electronics. It can work, but it's VERY clunky. That's why the automotive industry as a whole abandoned it rather quickly. Trade balancing a weight with balancing an RPM and you get the idea.
The stalling happened when decelerating on an automatic, so drivetrain load slowing down engine, plus a decreasing RPM as the fluctuation was going from high to low. It was enough to push the engine past its cutoff point and for it to stall.
End of the day is, for a DeLorean, this is normal. All because DMC picked K-Jet.
-
Mines an auto and it doesn't stall ...