2007 Citroen C4 1.8 vtr+ petrol
Rev drop and tries to stall when pulling away

Avatar
Christian
Driver
1 points

Problem added: Sep 25, 2020 (3 weeks ago)
Car starts, runs and drives fine except when pulling away. As i get to the biting point the revs drop right down and the car tries to stall

Car details
Car: Citroen C4
Variant: 1.8 vtr+ petrol
Model Year: 2007
Replies and Fixes
Avatar
bustedknuckles
Legend
1,988 points

Sep 25, 2020 (3 weeks ago)
Take it there’s no modifications on vehicle that could be causing the issue ,and no misfire ,could be a number of things would start by checking for any loose hoses around intake and check for codes
Avatar
Christian
Driver
1 points

Sep 25, 2020 (3 weeks ago)
No mods and i have had i plugged in and no codes. No noticable misfire. It Only happens when i first start the car, it is fine after that. When the revs drop it bogs down and doesn’t make a difference how far i push the accelerator, after a couple of seconds the revs pick up and its fine
Avatar
bustedknuckles
Legend
1,988 points

Sep 25, 2020 (3 weeks ago)
Would clean out the intake throttle see if that helps other thought is engine coolant temp sensor possibly out of spec giving ecm incorrect value when cold ,could be difficult to find if so intermittent .
Avatar
Christian
Driver
1 points

Sep 25, 2020 (3 weeks ago)
Thank you, i will have a go cleaning the intake throttle tomorrow. I will update after if it has helped or not
Avatar
Christian
Driver
1 points

Oct 10, 2020 (1 week ago)
Update, So i cleaned the intake throttle that was already pretty clean, i also got a new map sensor.
Im sure it is running rich, it now bogs down under 2000rpm almost all the time with the occasional backfire, there is still no codes showing, i have ordered a new coil pack that should arrive today, im hoping this will help.
Where is the engine coolant temp sensor located so i can check that please
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