# Unexpected stall: WTF is going on? \*Update: Videos\* **URL:** \ **Category:** SON240sx Automotive\ **Created:** [May 21, 2005, 3:00pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844 "2005-05-21T15:00:43Z")\ **Posts on this page:** 20\ **Page:** 3
**Author:** ![Racer\_XTREME](https://avatars.discourse-cdn.com/v4/letter/r/e47c2d/32.png) [@Racer\_XTREME](https://forums.speedlife.net/u/Racer_XTREME)\ **Post date:** [May 31, 2005, 11:47am UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/41 "2005-05-31T11:47:42Z")
> [@Gonad](#): > > Also when I am giving throttle and the RPMs are below 2500ish, the motor > shakes and its like there is no power as I’m giving throttle. Eventually it > smooths out. Woah, I know of two reasons that ive had that happen, 1 with the KA the sparkplug wire was broken but it wasnt visible, car was running on 3 cylinders. 2nd time. when i first installed the SR, turned her over he would barely idle it was stumbly and then just died UNLESS i pressed the throttle and it seemed to go smooth. The reason, one of the injectors was not sealing properly into the intake manifold. So look at your injectors, look at the rubber seals into the manifold, look for cracks, unplug each injector 1 at a time and see if that changes anything. Look for gas stains on the manifold, and also smell for gas. ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [May 31, 2005, 1:17pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/42 "2005-05-31T13:17:52Z")
Any precautions to take befrore removing injector from rail? I can smell gas but thats because I took the AIV out and the fuel vapour line is dangling in the engine bay (probablly not a good idea in case of spark) :noes: Whats the reason for that vacuum reading at the FPR? ---
**Author:** ![DTS](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@DTS](https://forums.speedlife.net/u/DTS)\ **Post date:** [May 31, 2005, 1:28pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/43 "2005-05-31T13:28:47Z")
if you havent taken out your injectors before i highly doubt a problem like that would happen out of nowhere. did you check spark on all 4 cylinders ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [May 31, 2005, 2:21pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/44 "2005-05-31T14:21:05Z")
> [@DTS](#): > > if you havent taken out your injectors before i highly doubt a problem like that would happen out of nowhere. > > did you check spark on all 4 cylinders Checked the worst plug and it created a spark (orange spark). So they seem ok :dunno: I’m holding off on putting the new plugs because I highly doubt they are at fault. Damn this sucks. ---
**Author:** ![Racer\_XTREME](https://avatars.discourse-cdn.com/v4/letter/r/e47c2d/32.png) [@Racer\_XTREME](https://forums.speedlife.net/u/Racer_XTREME)\ **Post date:** [May 31, 2005, 2:51pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/45 "2005-05-31T14:51:33Z")
> [@DTS](#): > > if you havent taken out your injectors before i highly doubt a problem like that would happen out of nowhere. > > did you check spark on all 4 cylinders yeah but injectors can clog up. Gonad i meant unplug the wiring plug from each injector 1 at a time, if the idle doesnt change then you found your problem. If you do remove the injectors themselves you need to depressurize the system. ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [May 31, 2005, 5:03pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/46 "2005-05-31T17:03:14Z")
I unplugged each injector harness as the motor was idling. As I did one by one the idle changed and obviusly it was noticable what was happening. I’m going to look into the EGR as it could be stuck open. FYI I haven’t used any injector cleaner or any additive in my engine as long as I have owned it. ---
**Author:** ![Sasha\_SG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sasha_sg/32/5477_2.png) [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)\ **Post date:** [May 31, 2005, 7:12pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/47 "2005-05-31T19:12:59Z")
watch the fuel pressure as it hesitates and dies, if it is 44psi the whole tiem you can rule out the fuel pump. Dont just check it while the cars running, obviously its fine then. Check your TPS as well if it has trouble with tip in then the TPS is to blame most of the time, it should be 0.45v at idle and about 4v at wot remember its an intermittant problem that means whatever is fucking up is only fucking up sometimes, these are the hardest problems to find! ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [May 31, 2005, 7:26pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/48 "2005-05-31T19:26:30Z")
Ok, here’s a weird one. I disconnected the EGR and the BPT valve. Car was idling and running but a couple times it choked and a couple times it died (not as often as before). This was over a course of maybe a couple hours. As I was checking the timing, here’s what I found: #1 cylinder wire - erratic pulse from timing gun #2-#4, coil - Smooth consistent pulse So I switched the plug wires #1 and #2 (so the original wire from cylinder #1 is now on the #2 cylinder). And here’s what I found: #1 cylinder wire - erratic pulse from timing gun #2-#4, coil - Smooth consistent pulse So this leads me to believe that perhaps it’s not the plug wire. So I switched everything back to original form and bumped my timing up to about 20 advanced. Car seeemd to run smoother and idle fine. But I noticed it was running a bit warm (220-230F) - I have no clutch or e. fan running btw so it’s normal to overheat. I drove it around the block a few times to let it cool down. It was now at 180F and I slowed down and waited in neutral for a few sec. and the car just shut off. :shock: Before I turned in for the night, I checked the tming once more. The wires were fairly consistent now and #1 cyl wasn’t as erratic as before. Also I noticed #1 and #4 were the only cylinders where you can see the timing ticks with the light; #2 and #3 didn’t show the ticks with the timing light. **Video #1** Light hooked to #1 cylinder wire. You can obviousl ysee the erratic pulse [http://240sx.cubicdesign.com/videos/2005/timing/cyl1.avi](http://240sx.cubicdesign.com/videos/2005/timing/cyl1.avi) **Video #2** Light hooked to #2 cylinder wire - might be hard to tell but it was pretty smooth pulses [http://240sx.cubicdesign.com/videos/2005/timing/cyl2.avi](http://240sx.cubicdesign.com/videos/2005/timing/cyl2.avi) ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [May 31, 2005, 7:44pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/49 "2005-05-31T19:44:15Z")
I can probablly contribute my erratic timing light pulses on #1 due to placing the timing light probe too close to the distrib. So maybe it was picking up signals from the other plug wires. I’ll check some more and move the wire away/more independently. ---
**Author:** ![Sven](https://avatars.discourse-cdn.com/v4/letter/s/e47c2d/32.png) [@Sven](https://forums.speedlife.net/u/Sven)\ **Post date:** [May 31, 2005, 11:35pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/50 "2005-05-31T23:35:18Z")
This is the correct link for cylinder 1 [http://240sx.cubicdesign.com/videos/2005/timing/cyl1.avi](http://240sx.cubicdesign.com/videos/2005/timing/cyl1.avi) This is the correct link for cylinder 2 [http://240sx.cubicdesign.com/videos/2005/timing/cyl2.avi](http://240sx.cubicdesign.com/videos/2005/timing/cyl2.avi) (both of your links pointed to cylinder 1 … confusing :P) ---
**Author:** ![Twitchy](https://avatars.discourse-cdn.com/v4/letter/t/d9b06d/32.png) [@Twitchy](https://forums.speedlife.net/u/Twitchy)\ **Post date:** [June 2, 2005, 9:00am UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/51 "2005-06-02T09:00:35Z")
Did you ever sort this out im having similar probs From my list of readings on the topic, Im voting for your maf sensor being pooched. I also have a clutch fan if you want it. I need to get my grubby mitts on someone elses MAF sensor to see if mine is in fact shot. YOu can also take the purge line off the charcoal canister, plug it, and test drive it like that to see if it works- and if it does then the problem could be a vapor line. The other thing was removing the vacum line from the FPR and plugging it to see what happened. Do you get a funny power loss as you drive along too…like a hiccup almost… cause I do now and then. And its identical to the time when the intake pipe slipped outof the TB and thus caused the MAF to get an improper signal cause not enough air was going through it, i mean its exactly the same, which is why i think its your MAF, and mine. ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 2, 2005, 12:49pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/52 "2005-06-02T12:49:34Z")
If MAF was faulty, when it is stumbling, I wouldn’t be able to rev past 2500. When it’s hesitating at low RPMs I can rev past 2500 (at which point it smooths out). I’ve sort of ruled out MAF for now but you never know. All my AIV and carbon canister stuff is gone and eveything plugged up. Mind you I have been driving some 2000KMs with this stuff gone before this just happend. ---
**Author:** ![Twitchy](https://avatars.discourse-cdn.com/v4/letter/t/d9b06d/32.png) [@Twitchy](https://forums.speedlife.net/u/Twitchy)\ **Post date:** [June 2, 2005, 1:08pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/53 "2005-06-02T13:08:20Z")
double check but i think if the maf is giving NO signal (ie missing or unplugged) it wont rev over 2500 rpm but if its out of whack it will… cause if its not the maf then i dont have a clue and i will sell my car and get a pickup truck from the 70’s where you can fix problems like this with a flathead screwdriver ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 2, 2005, 2:30pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/54 "2005-06-02T14:30:35Z")
> [@Twitchy](#): > > double check but i think if the maf is giving NO signal (ie missing or unplugged) it wont rev over 2500 rpm but if its out of whack it will… > > cause if its not the maf then i dont have a clue and i will sell my car and get a pickup truck from the 70’s where you can fix problems like this with a flathead screwdriver :werd: Carb \> EFI Someone nearby wanna lend me their MAF :fingersx: ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [June 2, 2005, 5:47pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/55 "2005-06-02T17:47:25Z")
Come pick mine up my cars going no where soon… ---
**Author:** ![Sasha\_SG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sasha_sg/32/5477_2.png) [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)\ **Post date:** [June 2, 2005, 9:51pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/56 "2005-06-02T21:51:16Z")
that, and you can run on a map sensor now ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 2, 2005, 9:53pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/57 "2005-06-02T21:53:25Z")
> [@Sasha (Turbo)](#): > > that, and you can run on a map sensor now It’s not the MAF; Jantos came with his and no dice. We think it’s the CAS/Distributor. ---
**Author:** ![Racer\_XTREME](https://avatars.discourse-cdn.com/v4/letter/r/e47c2d/32.png) [@Racer\_XTREME](https://forums.speedlife.net/u/Racer_XTREME)\ **Post date:** [June 3, 2005, 5:20am UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/58 "2005-06-03T05:20:12Z")
> [@Gonad](#): > > [quote=Sasha (Turbo)]that, and you can run on a map sensor now It’s not the MAF; Jantos came with his and no dice. We think it’s the CAS/Distributor.[/quote] makes sense considering your ECU was telling you that. ---
**Author:** ![Sasha\_SG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sasha_sg/32/5477_2.png) [@Sasha\_SG](https://forums.speedlife.net/u/Sasha_SG)\ **Post date:** [June 3, 2005, 4:37pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/59 "2005-06-03T16:37:44Z")
> [@Racer X](#): > > [quote=Gonad][quote=Sasha (Turbo)]that, and you can run on a map sensor now It’s not the MAF; Jantos came with his and no dice. We think it’s the CAS/Distributor.[/quote] makes sense considering your ECU was telling you that.[/quote] lol agreed jantos bring a dizzy and get on that shit ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [June 3, 2005, 7:07pm UTC](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844/60 "2005-06-03T19:07:22Z")
Man this is nuts. Dude on KA-T is telling me it’s seriously related to my fuel system and my car running overly rich. Time for SR? :dunno: [Previous page](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844.md?page=2) [Next page](https://forums.speedlife.net/t/unexpected-stall-wtf-is-going-on-update-videos/85844.md?page=4)