VTCS delete RPM drop?

T

The_big_dill

• Jul 25, 2014

• #1

Hi all,

I just did an overhaul of my intake with all new gaskets and have been working my way through the problems slowly. I have pretty much figured out all the problems, except for one.

On a cold engine, when I start, the engine drops to about 500 rpm and seems like its about to die. If I give it some gas, it will go back to 700-800 and then drop to 500 intermittently. This is only an issue for the first 5-10 seconds of operation.

When warm, it idles great and revs great.

So is this a result of the VTCS delete or did I mess up somewhere?

 

D

duffbuster243

• Jul 25, 2014

• #2

Yes, cold idle issues and cold throttle response is a common issue until then engine warms up.

 

T

thuzil

Member

:

Mazda, Protege Heavily Modified

• Jul 25, 2014

• #3

Ditto. It will be worse in the winter.

 

T

The_big_dill

• Jul 28, 2014

• #4

Haha, I can totally live with this, I just wanted to make sure I didn't miss anything while putting the intake back in.

To be completely honest, I actually prefer the low RPM idle at cold start. Reason being that the oil is viscous and all the metal is cold, as long as it can keep the oil pump running, the lower the rpm the better. I always wait at least 10 seconds after start before doing anything anyways.

 

N

njaremka

Wiggity-Wack-O-Tack

Contributor

:

2012 Mini R55

• Jul 28, 2014

• #5

if you have a manual transmission, get an MP3 ECU. it will help with the cold start issues of the removed VTCS.

 

T

The_big_dill

• Jul 28, 2014

• #6

njaremka said:

if you have a manual transmission, get an MP3 ECU. it will help with the cold start issues of the removed VTCS.

Click to expand...

A+ advice.

Thanks for the suggestion!

 

M

mp5la

Member

:

2002 Mazda Protege 5

• Jul 28, 2014

• #7

Not only will it help with that issue, it smooths the powerband out nicely across the board. It's a subtle change, but one that you'll really appreciate the more you drive with it.

 

S

Suliman

Member

• Jul 28, 2014

• #8

Anyone know of a good MP3 edition ECU source?

 

B

Brian_K

Member

:

Protege5

• Jul 29, 2014

• #9

Suliman said:

Anyone know of a good MP3 edition ECU source?

Click to expand...

pm this guy

http://www.mazdas247.com/forum/show...-MP3-ECU-150-shipping&highlight=mp3+ecu+flash