I have been having issues on startups with my car for the past several months. It started after I installed injectors, cams, and o2 housing. I am having a second tune to rule out that problem so I am assuming its mechanical. What could be the cause. Car sometimes struggles to turn over when its from a warm start; hot starts are good. I am going to adjust cranking enrichment tables on this tune to exclude that but last tune it did nothing.

 

**** anybody! Before I put a match to this friggen thing....

 

Cams = will not cause temp related start up issues.
o2 Housing = will not cause temp related start up issues.
Injectors = will cause temp related start up issues if not scaled properly.

This is a tuning issue. Log your start up. Have your tune adjusted by a pro.

Your injectors my be scaled too big and at certain temps its not adding enough fuel at start up.

 

Vids or Ban


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This. Your startup map is going to be the issue.

 

what size injectors are you running?

 

PTE 880's are the injectors. As far as a tuner I have Mellon working on my tune at the moment. I think he is experienced enough to scale injectors properly. I have logs on startup, log 1 was was on a hot start with no issues the other was a warm which I had issues. I will send them to whoever is interested just give me an email. I would assume on larger injectors there is too much fuel on startup?

 

If you you got Mellon working on it, why put up a thread?

I have the same 880's in my car scaled @ 770.

You gotta get your latencies/fuel trims in check and you should be fine.

 

as I've mentioned to Eric, I've tuned hundreds of cars with 880/1000cc injectors without startup issues. The problem is most likely something mechanical. I've had a few customers that need to adjust the BISS or replace the ISC. His previous tuner had the same problem.

 

^ from just changing injectors?

 

I guess? Whats the ISC?

 

Idle speed control valve .

 

Every thread that has BISS mentioned in it relates to poor idling. My car isn't really idling too bad at the moment. Gets a little boggy at times but usually rises back to wear it should be.

 

if you want to rule out the injectors you could put the stock ones back in and stock tune

 

Just put the stockers back in with the stock rom and voila! Car starts perfect on the temp range I was having issues in. I was confident it that was the problem after doing several cool down sessions and restarting it to make sure. Once I put the 880's back in there was an issue. What to do next?

 

Did you put new 880's in their, make sure they're not leaking when the car is off.