rich.edrsoc

Hi,
My car is cutting out or stuttering when accelerating. It always happens when accelerating, at half throttle or harder. I cant ‘make’ it do it, most times I can plant the throttle and it’ll just pull through to the next gear change fine. It just randomly happens, it usually catches me unaware, but it is like a boost cut.
Pretty sure a boost cut would come in every time I accelerated up through the gears? And not at half throttle?
Has happened quite a few (random) times now, at first I thought it was due to low fuel level. Started doing it about two weeks ago.
Once the stutter has passed, about 1 or 2 seconds, it carries on accelerating as normal…

The car is pretty much standard.
Could it be the fuel pump?

tabetha

How olds the fuel filter ?, though this would tend to not clear up after a few secs when still on boost.
I would do the wiggle test, particularly the CPS connector.
It's possible to be the pump but does not sound like it, but I assume it is rewired, the same as the fan circuit ?
tabetha

RobertM

Mine did about the same, turned out the actuator was broken. It's most likely to occur at low revs and partial throttle, 'cause that's when the pressure will be the highest (provided the actuator does nothing). Now my fuelpressureregulator is broken, leaking into vacuumhose, so I have a lot of rubbers failing on me lately :-(

LHD220Turbo

iTrader: (4)

it could be lots of things to be honest

if you cant take it to someone who know's what they are doing, then start with the cheap things

1) old fuel filter
2) old fuel
3) Phase sensor
4) crank position sensor (CPS)

my money is on the CPS or phase sensor

scotty4130

sounds like similar symptons to mine, checked the phase sensor, not a drop of insulation left on either wire! Changed that and its been fine since.

rich.edrsoc

thanks for the help guys!

have done the 'wiggle' test, it hasn't cut out since yesterday.
But the randomness of the cutting out/stutter means i don't know if it's sorted yet.... time will tell.

Started reading about the phase sensor, i think there maybe more reason to look to this than anything else. If anyone has read my other posts, my car is smoking a bit under load, possibly bore wash from overfuelling (hopefully that and not rings!) which, if i've understood it right, can be caused by a dying phase sensor....

Could i be on to something here?

Might try this, not too pricey for once!

LHD220Turbo

iTrader: (4)

the smoke coudl be caused by a few things, what colour is the smoke

normally if its fuel it will be a balck'ish colour

if its blue colour it be be anything from, rings, stem seals, guides or turbo

i would always recommend renewing all sensors; MSD so a sensor kit for around Ł80 (i think) but not sure if that includes phase

replace the cheap things first then go from there

rich.edrsoc

it's bluey grey smoke, the fuel washes the oil off the bores, causing the smoke and oil consumption... (i think i'm right there?!)

the head and turbo have been rebuilt about 2/3000 miles ago, so can almost rule them out.

hopefully it's all down to fueling and not rings just yet! should get some answers on thursday on the rollers...

sensors are on the 'to be done' list now anyway, whatever the result...

cheers for the help

tabetha

I would imagine the phase is only used when starting, don't know for sure, but this isn't your problem anyway.

TVRVixenYB

Hi rich.edrsoc, did you manage to figure out your turbo cutting out? I have the same issue, on hard acceleration, my turbo does not engage, almost like ECU cuts off the fuel. I pump the accelerator multiple times, and then it randomly kicks in?????? It does this rather more fequently.

qed296

I'd check the dates on these posts your replying to or start your own to get direct replies.

TVRVixenYB

Yes, some of the posts are old, but they may still be around and may have sorted their cutting out issue, and might be willing to share??? If you don't ask, you will never know, will you?

qed296

True, but from experience starting a new post specific to your problem will get a better pool of answers.

Good luck in sorting your issue's.

TVRVixenYB

Very true, but I am unable to post new. I can only answer existing threads and posts.

Wolvesboy

This could be something quite simple as coil, leads or plugs. Sounds like the car is struggling under load - they are the basics I would check before anything else.

TVRVixenYB

I have been advised to check the "Cam Timing Sensor" to make sure it is parallel to the trigger and is gapped properly between .20 mm to .30 mm. It feels like it is the ignition cutting out. So, if the dizzy shaft is worn, and have a greater than 4 degree of play, it needs to be rebuilt, as it will not stay gapped properly under load. There is a website in the UK which is very helpful for YB engines. www.autodynamix.co.uk They have a step by step instruction how to perform the check, as well as a wealth of other helpful tutorials.