Terrible Cold Start

[soursamo]

Been chasing a weird cold start issue.

On first start after sitting for a long time it cranks more and finally starts. During the cold start phase the idle is very inconsistent, has died once or twice and just jumps around randomly until the cold start is done.

Once the cold start is over idle smooths right out. Driving there is some very slight hesitation at low rpm but there are zero codes being thrown.

New plugs, did a new coil pack.
I'm getting ready to do some of the big maintenance items but until then I would love to figure this out.

[omgzirra_exe]

Originally Posted by soursamo

Been chasing a weird cold start issue.

On first start after sitting for a long time it cranks more and finally starts. During the cold start phase the idle is very inconsistent, has died once or twice and just jumps around randomly until the cold start is done.

Once the cold start is over idle smooths right out. Driving there is some very slight hesitation at low rpm but there are zero codes being thrown.

New plugs, did a new coil pack.
I'm getting ready to do some of the big maintenance items but until then I would love to figure this out.

cold start is usually associated with the secondary air pump that is flaps open on cold start and once warmed up they closed. this is obviously to heat up the o2 sensors.

so my guess is you might have a SAP that might not be functioning all the way properly.

hard to tell with no codes, but a failing SAP will throw a SAP code, but it has to be showing failed.

[soursamo]

Originally Posted by omgzirra_exe

cold start is usually associated with the secondary air pump that is flaps open on cold start and once warmed up they closed. this is obviously to heat up the o2 sensors.

so my guess is you might have a SAP that might not be functioning all the way properly.

hard to tell with no codes, but a failing SAP will throw a SAP code, but it has to be showing failed.

Interesting!
Yeah I managed to get ONE code for o2 sensor so I did replace both the pre cat ones.
I'll check into that secondary air pump, thank you

[omgzirra_exe]

Originally Posted by soursamo

Interesting!
Yeah I managed to get ONE code for o2 sensor so I did replace both the pre cat ones.
I'll check into that secondary air pump, thank you

yeah that sounds like it might be the case, as i experienced my o2's constantly wearing out faster. which lead me to the SAPs.

and if the SAP is stuck open, it will cause o2 sensor faults as well.

[omgzirra_exe]

forgot to mention, if you want a quick remedy as long as you are catless, just do a cold start delete.

[soursamo]

Just ordered one, will add to the giant pile of parts!
Thanks for the info

[omgzirra_exe]

Originally Posted by soursamo

Just ordered one, will add to the giant pile of parts!
Thanks for the info

yeah it's gonna suck replacing them lmao. might as well do both.

[soursamo]

Originally Posted by omgzirra_exe

yeah it's gonna suck replacing them lmao. might as well do both.

The pump is the easy part, just on the top under the manifold. The two valves are another story lol

[lauz]

I jave the secondary SAP error. Coding it to remove the error is a solution ?

[omgzirra_exe]

Originally Posted by lauz

I jave the secondary SAP error. Coding it to remove the error is a solution ?

pull the fuse. then tune it out. unless it's stuck open. then you have to go in and replace it.

[lauz]

Seems its closed