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View Full Version : HELP! Random revs/flooding.



Laszcal776
01-16-2011, 10:44 PM
I've posted regarding this problem once, but didn't get any replies. Anyway, I'm trying again.

Completely randomly my car (2001 1.8) will flood when starting. I can get it started after letting it turn over a few times (letting it rest in between tries) Also (usually in that same start where it flooded), it will randomly start to rev (up) to 3k rpm. The reving will stop on it's own after a little bit of driving.

Also, did a short test (only once) yesterday where I held the gas pedal down about half way when I started. It chugged up to start, but did no problem.

First thought: ECU gone bad?

Second thought: Possible sticky/bad throttle. Anyone know of any threads that relate to this?



ANY help on this would be greatly appreciated. It sucks when I have to just sit there waiting for it to burn off that fuel when I'm starting, or it randomly revs when I go through the drive thru. [>_<]

dumpedb5
01-17-2011, 12:06 AM
Vaccum leak?

Laszcal776
01-17-2011, 12:48 PM
Where would I look for something like that?

Dallas09
01-17-2011, 03:17 PM
Any codes? Hard starting is most commonly caused by the coolant temperature sensor.

Laszcal776
01-17-2011, 09:55 PM
P1296
Engine cooling system malfunction

I think I also got a code for a coolant sensor the other day (if there's a different one than this one).

Going to replace the sensor ASAP!

Laszcal776
01-17-2011, 09:56 PM
Yea, I had been looking up on forums and saw a few people had sensor problems. Figured I'd see if I got a code for that. Turns out, I did.
The other thing that I may try doing is reseting the ECU, and cleaning the throttle body.

dcampana
01-18-2011, 09:49 AM
yes the CTS is more than likely the culprit. keep us posted

Laszcal776
01-22-2011, 09:55 PM
Alright. Finally got around to replacing the sensor (busy schedule) (VERY). Anyway. Car starts up fine, and I haven't had any reving yet, but the gauge won't work correctly still. It'll jump up to the first bar and then back down do zip zero nada. Any ideas?

Dallas09
01-23-2011, 12:02 AM
What gauge, the coolant temp gauge?

Laszcal776
01-23-2011, 11:43 AM
Yea. That's the one.

Dallas09
01-23-2011, 12:15 PM
Its possible you have a bad thermostat... Where did you get the coolant sensor from?

Laszcal776
01-23-2011, 12:32 PM
carquest.

Laszcal776
01-23-2011, 01:03 PM
UPDATE:

Aight, so a little something more. I was skimming over other threads that remotely have anything to do with my problem, and I read about a little trick....

"A little trick to our cars is you can check your coolant temp another way than by the needle on the dashboard. In the climate control, hold the recirculating button and press the "up" arrow for the vents. You should then see "1Q". Change it to "51Q" for coolant temperature by using the + and - buttons for the temperature. Normal operating temperature should be 90 (centigrade).
My needle does not work so I check up on this from time to time.

Just for fun, "27Q" is RPM... it's a fun distraction sometimes."


So, I went and did this. It turns out that the car is reading the temperature just fine (watched it warm right up). So, I figure that with replacing the first sensor, I fixed my original problem, but now I've got to replace the second sensor (lower on the drivers side towards the front of the engine) in order to fix the gauge. If that doesn't work, I'll do the thermostat.

Laszcal776
01-23-2011, 08:07 PM
After some more driving, I've noticed that the gauge will rise to the middle mark (like it should) whenever I idle for long enough, but when driving, it'll drop back down to 0.

So, there's no doubt the thermostat is fine. I'll be doing that second sensor asap.

I'll be gone for a week, so no replies during that time. Sorry!

Laszcal776
01-23-2011, 08:08 PM
Also, on the post two above this one, where I mentioned that trick.
Just fyi, 17C is MPH. XD