Exhaust back pressure test - SE London (or near)

[IntriguedUser]

Hi all.

Sorry if this isn't allowed.

I'm looking for a garage/someone who can do a exhaust back pressure test either today or tomorrow around the SE London area. I have been to 6 garages and have been told cats on petrol cars dont go wrong or they're busy for 3 weeks.

Can anybody help, willing to pay.

Kind regards

[IntriguedUser]

Honda prelude 2.2

running very lean, supposedly 197bhp but feels in the 150 to 170 region. Lots of pinging and detonation under load in higher gears.

- no EML light

- Compression test 240psi on all 4 cylinders.

Reason for backpressure test is too see if there's a restriction in the exhaust ie a partially blocked catalytic converter.

I dont know where to turn really, I'm sure someone with a good scan tool that can show the values of different sensors would be able to pinpoint my problem straightaway however I don't know anyone.

Honda specialists are booked up 3 weeks ahead and I need the car

[IntriguedUser]

I'm booked in to get the cat replaced on thursday.

Here are a few more symptoms:

- bogging

- car feels like its slowing down itself, as if a caliper or handbrake is stuck but everything is moving freely.

- if I hold the speed steady at say 20mph the car feels like its lurching, then trying to go, then lurching. Not enough to cause a massive jolt but enough to feel. This yoyo effect is more noticeable in 1st and 2nd gear.

I'm wondering if the timing may have jumped a tooth. Or possibly a fueling issue. No codes, vtec still works car still reaches the factory redline of 7800rpm.

I'm going to get the cat replaced and then take it to a specialist to do some diagnostics. I will let you guys know the outcome.

Cheers