Sluggish, slow, engine low power

Tiny
BDRAW
  • 2003 PEUGEOT 307
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
  • 120,000 MILES

Hi,

I recently bought list car from an auction. The car has a lumpy idle and shakes ever so slightly like it has a misfire. It is under powered, sluggish and the throttle response is pretty shocking too. The car will struggle to hold a steady rpm. For example. I will take it up to 1,500 rpm and hold the throttle still, but the rpm will drop.

Earlier today I plugged in a code reader. It does not support Peugeot but I was able to access the live data. Eg: Rpm, oil temperature, coolant temperature etc. And noticed something called

LTFT (long term fuel trim)

and

STFT (short term fuel trim)

The STFT was fluctuating quite a lot with a wide range. I have no idea what it is, but googled what they should be. As far as I am aware the LTFT should be anywhere from 12% to 14% Where as the LTFT on my Peugeot is at a constant 0.78%.

I also read that the STFT should be 6% of the LTFT or something a long those lines. But instead it is all over the place constantly fluctuating on idle to and from 0.00%, 3.12%, 0.078%, 2.34%, -1.57%, -0.75%.

When the engine is revved the STFT jumps to 11.71% and the LTFT stays at a constant 0.78 when revved and on idle. It does not change.

As far and I am aware this means the car is compensating for something, creating a rich mixture. Am I right in thinking that it could be any of these?

Maf or O2 sensor fault, Intake gasket leaks, cracked inlet or split hoses, clogged or dirty fuel injectors, fuel delivery issues or exhaust restrictions such as a clogged catalytic converter?

Originally I thought I might have an inlet leak not only because its plastic, but because if you stab the throttle there is a fluffing sound from the inlet and then it revs immediately afterwards, but delayed. There is also a rich exhaust smell coming from the engine bay.

My theory was then ruled out when I read that if you hold the rpm at a steady 2500 and the STFT immediately decreases and goes down to an acceptable level and the LTFT starts to go down too, that, that means you have an air leak. Whereas my LTFT stays at 0.78 no matter what and the STFT rises a as high as 11.71%.

From this data could anyone please narrow down what it could be? I am stumped. I do not want to throw money at the car, going out and buying loads of different parts until I find the problem.

Thanks for your help and expertise.

Kind regards,
Ben.

Do you
have the same problem?
Yes
No
Monday, July 24th, 2017 AT 3:16 PM

29 Replies

Tiny
2CARPROS KEN
  • ADMIN
  • 8,694 POSTS

Hello,

It sounds like you have cylinder with low compression which will cause those readings. Here is a guide to help you run a test to confirm the problem.

If you do not have a gauge you can rent one from the auto part store for free.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run this test and get back to us we are interested to see what it is.

Cheers, Ken

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 2:07 PM
Tiny
JUBEZ
  • 2003 PEUGEOT 307
  • 540,000 MILES

My car is not going as fast as it should or as it normally does, even with my foot to the floor, however my revs arent affected. Initially I thought this was a clutch problem, however after reading so many articles online about clutches, Im now not so sure. My car isnt showing any other signs of the cluthc going eg slipping or smelling etc. HELP! :-)

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
  • 41,965 POSTS

Ensure the floor mat is not restricting the limit of accelerator movement.

Is the MIL indicating?

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
JUBEZ
  • MEMBER

OMG. It was my mat. I now feel like the biggest numpty EVER and cant stop laughing! I've been panicking about it being my cluthch and costing me a fortune! I am such aatypical girl :-) Thanks very much you have made my day! :-)

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
  • 41,965 POSTS

The thing just came to mind immediately when I saw your post so I don't know if it is yours or my lucky day, lol.

Have a great day.

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
JUBEZ
  • MEMBER

Thank you so much for your expertise! Lets class it as both our lucky days lol :-)
Thanks again!
:-)

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
XAERO
  • 2002 PEUGEOT 307

Engine Performance problem
2002 Peugeot 307 4 cyl Front Wheel Drive Manual 60000 miles

hi, I have a 2.0 litre 110 hdi 307. When outside air temp is below 12 degrees and engine is cold (below 65 degrees) can only get 2000 rpm max. As soon as temps go above these levels engine runs normally. Air mass and lambda sensors replaced to no avail. Please help.

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
PUGGIE
  • MEMBER

I've had the same problem for over 12 months now. Dealer has had car in a while back for a full week reproduced fault, registered fault codes but has been unable to fix it.

Any suggestions would be welcome.

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
DRDINO
  • MEMBER

Have you checked the coolant temperature sensor?

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
XAERO
  • MEMBER

Coolant temp sensor is ok, guy at work took plug off top of air flow regulator to check it out and it runs ok without it but sluggish at bottom end(takes longer for turbo to spool up). As soon as it is reconnected it runs like a sack of spuds again.

Even peugeot mechs can't work it out.

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
PUGGIE
  • MEMBER

I've had an anti pollution fault and had the particulate filter replaced.

They found the differential pressure sensor was full of water when trying to reprogram.

Since then I've not had the problem, but it wasn't all the time and could still come back.

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
KEANETRACIE
  • 2004 PEUGEOT 307
  • 1.4L
  • 2WD
  • MANUAL
  • 12,000 MILES

Hi,

my car is loosing power randomly and begins to shake when standing in traffic. What are the possible issues with this?

Tracie

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
HMAC300
  • EXPERT
  • 49,726 POSTS

We have no information on these cars as they are not sold in US, but you can get it scanned for codes and check fuel pressure with a gauge if you have one. Also clean throttle plate on both sides with choke cleaner and iac hole. Also check for a vacuum leak like a hose broken/leaking etc.

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:07 PM (Merged)
Tiny
FRANK REMMER
  • 2002 PEUGEOT 307

Engine Performance problem
2002 Peugeot 307 4 cyl Two Wheel Drive Manual 110259 miles

My car is a 1.4 HDI, it runs perfect on a flat road but looses power on a incline, airvalve checked ok, turbo checked ok. Please can you help.

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:08 PM (Merged)
Tiny
DAVE H
  • EXPERT
  • 13,514 POSTS

Start by replacing the fuel filter and adding a good fuel cleaner to the tank to clean the lines and injectors !

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:08 PM (Merged)
Tiny
DAVIDSPOG
  • 2001 PEUGEOT 307

Engine Performance problem
2001 Peugeot 307 4 cyl Two Wheel Drive Manual 55000 miles

car wont go over 30 and wont rev past 3000 rpm it is a 2litre diesel help being told egr valve

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:08 PM (Merged)
Tiny
DOCFIXIT
  • EXPERT
  • 18,993 POSTS

Check fuel pressure

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:08 PM (Merged)
Tiny
JTJ
  • 2006 PEUGEOT 307

2006 Peugeot 307 4 cyl All Wheel Drive

When driving for a while, engine not response to acceleration, and then stopped

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:08 PM (Merged)
Tiny
MHPAUTOS
  • EXPERT
  • 31,191 POSTS

Will it re start straight away?

Mark (mhpautos)

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:08 PM (Merged)
Tiny
JTJ
  • MEMBER

Yes, it re-start straight away after re-starting the engine immediately

Was this
answer
helpful?
Yes
No
Tuesday, July 25th, 2017 AT 8:08 PM (Merged)

Please login or register to post a reply.

Recommended Guides