# Supra not running right.. please advise. **URL:** \ **Category:** Shift518 Automotive\ **Created:** [September 21, 2008, 5:37pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078 "2008-09-21T17:37:03Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Boost\_Creep](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boost_creep/32/6366_2.png) [@Boost\_Creep](https://forums.speedlife.net/u/Boost_Creep)\ **Post date:** [September 21, 2008, 5:37pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/1 "2008-09-21T17:37:03Z")
So I replaced the battery yesterday on my car. Fired it up and attempted to take it for a drive. I got about halfway down the street and noticed the car wasn’t running right at all. (I let it warm up) Was stuttering and bogging etc… idle sounded OK though. Car is tuned with a piggyback ecu, also have an HKS VPC (Soon getting replaced by AEM EMS). Could a battery change make a car lose it’s tune? I didn’t think so… Been banging my head against the wall for a few days. Mods: APU… T60 single. 720lb injectors, piggyback ecu tune. HKS VPC… So far I’ve: Swapped the plugs out for NGK BRK7e’s to see if that was the issue. Negative. Car does the exact same thing. I tried resetting the ecu fuses, checked the battery cables, still no good. Can anyone reccomend anything else? ---
**Author:** ![Mk4\_30R\_Ban](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mk4_30r_ban/32/6347_2.png) [@Mk4\_30R\_Ban](https://forums.speedlife.net/u/Mk4_30R_Ban)\ **Post date:** [September 21, 2008, 5:43pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/2 "2008-09-21T17:43:06Z")
spend the extra money and get the motec m600. any luck on supra forums? id look there for help or talk to travis. ---
**Author:** ![JiM\_P\_2001](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jim_p_2001/32/6364_2.png) [@JiM\_P\_2001](https://forums.speedlife.net/u/JiM_P_2001)\ **Post date:** [September 21, 2008, 5:45pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/3 "2008-09-21T17:45:52Z")
boost/vac leak is what I’d check for first. Thats a common problem with any forced induction vehicle. Some cars won’t even idle with a small leak. ---
**Author:** ![Boost\_Creep](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boost_creep/32/6366_2.png) [@Boost\_Creep](https://forums.speedlife.net/u/Boost_Creep)\ **Post date:** [September 21, 2008, 5:46pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/4 "2008-09-21T17:46:14Z")
> [@Mk4 30R](#): > > spend the extra money and get the motec m600. any luck on supra forums? id look there for help or talk to travis. Tried on supraforums, still havn’t come up with much. I know Travis is pretty busy, I pmed him before. ---
**Author:** ![Mk4\_30R\_Ban](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mk4_30r_ban/32/6347_2.png) [@Mk4\_30R\_Ban](https://forums.speedlife.net/u/Mk4_30R_Ban)\ **Post date:** [September 21, 2008, 5:49pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/5 "2008-09-21T17:49:44Z")
it was running normal when last parked, battery died and now its where youre at now, is that correct? if thats the case, i highly doubt its a vac/boost leak. its probably related to the VPC. how is the data stored with the vpc as far as the adjustments, its been a while since ive seen one or dealt with it… time to MoTec it! ---
**Author:** ![Boost\_Creep](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boost_creep/32/6366_2.png) [@Boost\_Creep](https://forums.speedlife.net/u/Boost_Creep)\ **Post date:** [September 21, 2008, 5:58pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/6 "2008-09-21T17:58:50Z")
> [@Mk4 30R](#): > > it was running normal when last parked, battery died and now its where youre at now, is that correct? > > if thats the case, i highly doubt its a vac/boost leak. its probably related to the VPC. how is the data stored with the vpc as far as the adjustments, its been a while since ive seen one or dealt with it… time to MoTec it! I know. VPC is old school technology. I’m not sure how it works entirely. I’m going to be getting AEM EMS. Maybe this is god telling me its time. ---
**Author:** ![LKSi](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lksi/32/6316_2.png) [@LKSi](https://forums.speedlife.net/u/LKSi)\ **Post date:** [September 21, 2008, 6:00pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/7 "2008-09-21T18:00:41Z")
Unhooking your battery resets the ECU… so maybe your tuning thingy got reset too!!! ---
**Author:** ![big\_red](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/big_red/32/6328_2.png) [@big\_red](https://forums.speedlife.net/u/big_red)\ **Post date:** [September 21, 2008, 6:05pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/8 "2008-09-21T18:05:48Z")
> [@LKSwhy?](#): > > Unhooking your battery resets the ECU… so maybe your tuning thingy got reset too!!! +1 ---
**Author:** ![Boost\_Creep](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boost_creep/32/6366_2.png) [@Boost\_Creep](https://forums.speedlife.net/u/Boost_Creep)\ **Post date:** [September 21, 2008, 6:21pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/9 "2008-09-21T18:21:41Z")
> [@BIG RED](#): > > +1 Thought about that… but several people said it shouldn’t reset the tune. ---
**Author:** ![88slowmarro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/88slowmarro/32/6339_2.png) [@88slowmarro](https://forums.speedlife.net/u/88slowmarro)\ **Post date:** [September 21, 2008, 6:23pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/10 "2008-09-21T18:23:49Z")
> [@RBakerian](#): > > Thought about that… but several people said it shouldn’t reset the tune. prolly not gonna reset it but it could of thrown off some sensors that will need a relearn like i.a.c but if it runs rough all threw the range id check a maf sensor and see if its shitty or if suttin got unplugged accidentily ---
**Author:** ![LKSi](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lksi/32/6316_2.png) [@LKSi](https://forums.speedlife.net/u/LKSi)\ **Post date:** [September 21, 2008, 6:27pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/11 "2008-09-21T18:27:04Z")
I would think it was the piggy back … interesting. ---
**Author:** ![Allstar\_Graphics](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/allstar_graphics/32/6287_2.png) [@Allstar\_Graphics](https://forums.speedlife.net/u/Allstar_Graphics)\ **Post date:** [September 21, 2008, 6:27pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/12 "2008-09-21T18:27:43Z")
i thought the vpc was an actual set of knobs to tune. ---
**Author:** ![arodracing](https://avatars.discourse-cdn.com/v4/letter/a/7cd45c/32.png) [@arodracing](https://forums.speedlife.net/u/arodracing)\ **Post date:** [September 21, 2008, 6:52pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/13 "2008-09-21T18:52:49Z")
search for injector battery offsets, thats all i can think off ---
**Author:** ![Singh1](https://avatars.discourse-cdn.com/v4/letter/s/ba8739/32.png) [@Singh1](https://forums.speedlife.net/u/Singh1)\ **Post date:** [September 21, 2008, 6:57pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/14 "2008-09-21T18:57:20Z")
damn this is crappy news the only advise i usually give is turn it off, and turn it back on again, then call me back ---
**Author:** ![bennyfizzle](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bennyfizzle/32/6291_2.png) [@bennyfizzle](https://forums.speedlife.net/u/bennyfizzle)\ **Post date:** [September 21, 2008, 7:43pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/15 "2008-09-21T19:43:15Z")
Shoulda bought an E36 M3 /thread ---
**Author:** ![JiM\_P\_2001](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jim_p_2001/32/6364_2.png) [@JiM\_P\_2001](https://forums.speedlife.net/u/JiM_P_2001)\ **Post date:** [September 21, 2008, 7:45pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/16 "2008-09-21T19:45:11Z")
> [@BENNYFIZZLE](#): > > Shoulda bought an E36 M3 > > /thread He had an E46 M3 before the Supra… :headbang ---
**Author:** ![Boost\_Creep](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boost_creep/32/6366_2.png) [@Boost\_Creep](https://forums.speedlife.net/u/Boost_Creep)\ **Post date:** [September 21, 2008, 7:51pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/17 "2008-09-21T19:51:03Z")
> [@JiM P 2001](#): > > He had an E46 M3 before the Supra… :headbang And two e36 m3’s… The Supra has been crazy reliable for the HP it puts down. I cant complain. I’m thinking the ECU needs to relearn, and I need to drive it around for an hour or so and see what it does. I ended up breaking a crankcase hose because it was dry rotted when I swapped the plugs. So I’m waiting on that part. ---
**Author:** ![silverandslow](https://avatars.discourse-cdn.com/v4/letter/s/bc79bd/32.png) [@silverandslow](https://forums.speedlife.net/u/silverandslow)\ **Post date:** [September 21, 2008, 8:04pm UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/18 "2008-09-21T20:04:49Z")
I’ll take this problem car off your hands… ---
**Author:** ![Mk4\_30R\_Ban](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mk4_30r_ban/32/6347_2.png) [@Mk4\_30R\_Ban](https://forums.speedlife.net/u/Mk4_30R_Ban)\ **Post date:** [September 22, 2008, 2:17am UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/19 "2008-09-22T02:17:26Z")
> [@RBakerian](#): > > And two e36 m3’s… The Supra has been crazy reliable for the HP it puts down. I cant complain. I’m thinking the ECU needs to relearn, and I need to drive it around for an hour or so and see what it does. I ended up breaking a crankcase hose because it was dry rotted when I swapped the plugs. So I’m waiting on that part. the isolator hoses between the valve covers? if so, normal heater hose would work just fine, i think its 1/2" id. > [@Allstar Graphics](#): > > i thought the vpc was an actual set of knobs to tune. thats what i remember. its all analog ---
**Author:** ![lconrad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lconrad/32/6314_2.png) [@lconrad](https://forums.speedlife.net/u/lconrad)\ **Post date:** [September 22, 2008, 4:49am UTC](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078/20 "2008-09-22T04:49:11Z")
i’m pretty sure his setup is a piggy back…so he’s not able to change anything…it may just have to relearn [Next page](https://forums.speedlife.net/t/supra-not-running-right-please-advise/239078.md?page=2)