No VTEC and car "splutters" and cuts out violently over 4k

Post by **Drax** » Thu Dec 29, 2016 7:13 pm

njord wrote:Is that where the 5v is supplied from?

Seems like, according to the manual

Post by **JEBB4** » Fri Dec 30, 2016 9:40 am

Check wiring, strange that your getting too much voltage, possible short somewhere? Be it in ECU or through a wiring issue.. Hmm it's not like it's a large amount of voltage either like 1 volt, seems like your on the right track finding the source of the 5v feed, could be moister in a circuit bourd causing slight short... Interested to see what comes of this now...

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Fri Dec 30, 2016 11:17 am

Drax wrote:The manual is showing to change the a/t control unit as the next stage but his is an auto so I can't do that...

Why can't you do that?

Post by **Drax** » Fri Dec 30, 2016 2:16 pm

wurlycorner wrote:
Drax wrote:The manual is showing to change the a/t control unit as the next stage but his is an auto so I can't do that...
Why can't you do that?

Spelling mistake sorry wurlycorner, corrected now.

Was supposed to say "isn't"

Post by **Drax** » Fri Dec 30, 2016 2:17 pm

JEBB4 wrote:Check wiring, strange that your getting too much voltage, possible short somewhere? Be it in ECU or through a wiring issue.. Hmm it's not like it's a large amount of voltage either like 1 volt, seems like your on the right track finding the source of the 5v feed, could be moister in a circuit bourd causing slight short... Interested to see what comes of this now...

The manual does say to check for shorts in the wiring, not sure on how I'd do that though?

Post by **JEBB4** » Sat Dec 31, 2016 2:07 am

Best way is probably a short detector, which you run along the loom which beeps when it notices one, other than that it's a case of physically following the wire through the loom to the ECU to see if its possibly rubbing on another wire or an electrical connector in the loom has corroded pins or moisture causing it to pick up slight voltage from another source... Can be very time consuming to be done properly by pulling the loom apart

njord · Post by **njord** » Sat Dec 31, 2016 5:09 pm

Have you checked that you have correct volta else where and also had a look at grounds etc

Post by **Drax** » Sat Dec 31, 2016 10:01 pm

njord wrote:Have you checked that you have correct volta else where and also had a look at grounds etc

just checked the yellow wire and thats supposed to have 5v through it when the key is in the ignition, and there isnt a signle volt coming from it....

Post by **Drax** » Sat Dec 31, 2016 10:51 pm

ok im extra confused, the green ground wire seemed ok when i checked it using the resistance option on the mutlimeter - but it also seems to have voltage....1.3v ...

Cutz · Post by **Cutz** » Wed Jan 04, 2017 1:23 pm

Drax wrote:This problem is still apparent. took it to Bri last night and we checked the timing and it was pretty much bob on.

still got 2 error codes appearing when the problem happens, 7 and 20 which is TPS and ELD.

i swapped the TPS for a spare a few days ago so i dont think its that at fault. does the TPS need to be adjusted sometimes? once you place it on the TB, when doing up the bolts there is room for adjustment up or down.... ?

EDIT - forgot to add, now ive been in Will's car when it happens, the splutter and cut out are the same thing, its just a splutter and cuts the power (doesnt stall the car) briefly for a second more than anything.

it also now seems to vtec ok

check your thermostat earthing point, along with the other important ones in the engine bay;

1. rocker cover to engine mount/body
2. gearbox to body
3. intake manifold to engine
4. thermostat
5. battery to body
6. earths behind the headlights

if you're throwing up multiple faults they are most likely common to a single problem