# Weird lagging/surging while driving. Help ASAP

**URL:** <https://forums.speedlife.net/t/weird-lagging-surging-while-driving-help-asap/105283>\
**Category:** SON240sx Automotive\
**Created:** [April 6, 2007, 2:37pm UTC](https://forums.speedlife.net/t/weird-lagging-surging-while-driving-help-asap/105283 "2007-04-06T14:37:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![DJPyro](https://avatars.discourse-cdn.com/v4/letter/d/278dde/32.png) [@DJPyro](https://forums.speedlife.net/u/DJPyro)\
**Post date:** [April 6, 2007, 2:37pm UTC](https://forums.speedlife.net/t/weird-lagging-surging-while-driving-help-asap/105283/1 "2007-04-06T14:37:11Z")

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So here’s the deal.

I just installed a new SAFC-II, all wiring seems to be correct. System comes on, allows adjustment, reads airflow, reads TPS, reads RPM.

It’s installed on a Blacktop SR, with a 62 (redtop) ECU.

The car was running fine before the install of the SAFC, however it seemed a bit rich.

After installing the SAFC, I went for a little boot around the block, and noticed that there’s a realy weird lag on the throttle. It’s not a lag in response, but it dips/chugs much like the “Oh shit, we’re almsost outta gas” chug. There’s about a quarter tank so I don’t think it’s that.

I was concerned that it might be running MASSIVELY lean, so I richened the whole RPM band for high and low throttle 2%. It’s still doing it.

Also, this happens no matter what the throttle input, and it’s very inconsistant. It just kinda jerks/lags/bogs/whatever as I’m cruising along, or if I punch it. Now, I only took it out for about 5-10km, and I didn’t want something catastrophic to happen.

Any help ASAP would be nice.

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**Author:** ![240newbie](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/240newbie/32/5487_2.png) [@240newbie](https://forums.speedlife.net/u/240newbie)\
**Post date:** [April 6, 2007, 4:44pm UTC](https://forums.speedlife.net/t/weird-lagging-surging-while-driving-help-asap/105283/2 "2007-04-06T16:44:11Z")

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Got one of these in my car.  
1st when u installed it u cut the MAF wire and hooked it up to the in and out for the safc i assume (stupid question but i gota ask it).

2nd I would initialize the system (theres an option for this in the setup menu)

3rd Make sure you have it set to HOTWIRE in the setup menu i believe its either 5 in and out or 6 in and out (consult the online documentation)  
leave all fuel maps at 0 to start with.

4th ensure you have it set to 4 cylinder with the arrow pointing up (this is for the correct RPM and throttle reading)

Even if this is all correct i would initialize the SAFC and start again. If this still fails, i would remove the SAFC and re-connect the MAF signal wire directly again and see if your problem still persists.

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**Author:** ![DJPyro](https://avatars.discourse-cdn.com/v4/letter/d/278dde/32.png) [@DJPyro](https://forums.speedlife.net/u/DJPyro)\
**Post date:** [April 6, 2007, 5:50pm UTC](https://forums.speedlife.net/t/weird-lagging-surging-while-driving-help-asap/105283/3 "2007-04-06T17:50:36Z")

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Already initilized it, and it’s 5 and 5 for a stock MAF.

Turns out it had defaulted back to 6 cylinders without my knowledge, but it’s still doing that at low RPM.