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Welcome to the Hemi Swap Community! We want this to be an open forum where anyone can ask anything about the Hemi engine and doing Hemi Swaps. We find the information can be scattered all over the internet and want this to be a centralized place where we can talk amongst each other and share our questions and answers that may be able to help others going through similar Hemi swap situations. Please be kind to others and help out where you can while getting the information you need. Blake and Mike will be admins and answering questions here as well!

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jimmymartensson75

Dec 29, 2021

SKIM Delete

in Hemi Engines

Hi I´m doing a hemi swap, using a Hemi 5.7 from chrysler 300 -2006.

I had the original pcm send away to have the skim removed. The enginge starts and runs ok in Idle.

But when I press down the accelerator pedal andtry to rew the engine above 1500 rpm it starts to pumping and it seams like the fuel is cutting. I have fuel pressure at 58psi/4bar. I have done a tps relearn and checked that the throttle is following the gaspedal fine. Could the pcm have gone into limp mode? or any other ideas?

I also bought a second pcm that I'm trying to delete the skim using Hptuners. I followed the instruction from

Diyhemi youtube video. The enginge starts for one second and dies everytime. I put the skim in disabe and skim capable disabe/enable several times. I am using thestarter relay but if I put the relay i disable the enginge still starts for a second and dies. I´m using hptuners MPVI2 with a usb cabel. What can be the problem? The cable that tells the pcm that I´m using the starter relay is that C1-30 (black connector)?

Posting a video when the enginge runs with the original pcm

Best regards

Jimmy

2 comments

2 Comments

Blake Andermann

Dec 30, 2021

•

On the original ECM, the tune needs to be modified to allow the engine to go above 1400 rpm in park or neutral. The ECM isn’t seeing input from the trans is my assumption, so it thinks you are in park or neutral. Change that table and you should be fine. As far as the second ECM, you must not have performed the SKiM disable correctly. If it runs then dies, SKIM is probably still active.

jimmymartensson75

Dec 31, 2021

Replying to

Hi Blake

Thanks for the reply. I´m Planing to use my original transmission 727 automatic to bolt on my hemi. In Hptuners do I go into Transmossion table and put all the preset settings for trans options into disable mode? Is that how I solve the 1400 rpm problem? The fuel cutoff in park/neutral is set to 3800rpm.

To delete the skim in my second ECM, I have done the dubble writing first write all and then write for retrofit.. it almost feels like the ecm don´t respond to my writing. I will try a few more times.

Kind regards

Jimmy

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SKIM Delete