engines | Ask Honest John

Ask Honest John

Most recently answered engines questions

What are the best versions of the Peugeot 1.2 PureTech engine?

I understand the 1.2 PureTech Citroen engine is well regarded but have read reports of problems with the cam belt running in oil being unreliable. I gather it has been updated over its life and now is...

How does the ACT system work on 1.5 litre VW vehicles?

I have a Skoda Octavia 1.5.TSI Evo ACT. These engines are fitted with ACT, meaning when at certain times the 4 cylinder engine reduces to running on 2 cylinders. Do you have any information when and at...

How do PHEVs heat the interior?

Do modern PHEVs use the ICE motor to heat the cabin?

Are both the Audi A4 TFSI 35 and TFSI 40 virtually the same?

Are Audi A4 TFSI 35 and A4 TFSI 40 running cost the same (mpg, tax, emissions, insurance ) ? Apart from HP 150 and 200, all data i see varies. Some suggest 35 is cheaper to run, others suggest there is...

Are there advantages to having oil fed cam belts?

How reliable is the PSA 1.2 engine?

I have read a lot of bad press on the PSA 1.2 petrol engine, how much of this is actual and does it cover the turbo and non turbo engines?

Is it possible to modify a Euro5 engine to comply with Euro6?

Is it possible to modify a Euro5 engine to comply with Euro6? If so can the compliance be registered so the vehicle can go to clean air zones without penalty

My car is missing its air filter inlet scoop, is this important?

I have just bought a 2019 Skoda Octavia 1.5 petrol and the air filter inlet scoop is missing, is it important?

What's the best engine in the Rover 75?

I am looking for a Rover 75 and can't seem to find out which were built by BMW and which engine is a BMW engine. There is a 1.8 petrol, 2.0lt diesel and a 2.5 V6 petrol, don't really want a diesel so it's...

Do modern cars have automatic chokes?

I've just purchased a 72-plate Kia Picanto GT Line S. Do modern cars still have automatic chokes? My immediate area has 30mph camera controlled restrictions and I can poodle along in 5th but on the level...