405 1.6 carb to injection conversion... any point?

This is the Forum for all your Peugeot Technical Questions, Problems or Advice.

Moderator: RichardW

wheelzhavegone
Posts: 10
Joined: 05 Apr 2002, 07:52

405 1.6 carb to injection conversion... any point?

Post by wheelzhavegone » 16 Apr 2002, 07:19

I was wondering if there was any oint converting my 1.6 405 to injection using either the injection kit from a 205 gti or a later 405. Is there any point to this, im not in it just for the power but for getting rid of the troublesome carb too, but the power advantage would be good..... any thoughts out there?

alan s
RIP 2010
Posts: 2542
Joined: 26 Jan 2001, 16:53
x 5

Post by alan s » 17 Apr 2002, 02:52

Did this on a CX many moons ago. Got there eventually but it's the stuff nightmares are made of.
The thing you must remeber is that it's not just a case of unscrewing a manifold & carb & bolting on a fuel injection system. The major part of the operation is electrical namely wiring (and fitting) sensors, fuel pump, electric & normally fitted near the fuel tank, power to & from the ECU, wiring to the dash for the different warning lights etc included in the fuel injection system.
We eventually took the entire mechanicals and complete wiring harness & transplanted the lot, which believe it or not was the easiest option. If ever you've seen the size of the holes in the firewall of a CX and compared the size of the bunch of wires plus plugs to go through it, can you imagine the frustration when you pull one through after unravelling it from 20 or 30 others only to find that it's 2" short because you should have gone through the hole next to the one you chose? So you unravel the lot & change the hole only to find you go around another wire & have to remove that one also or neither will reach and so it goes on.
Do you swear a lot?? 'coz if you do this job, you're about to start. <img src=icon_smile_angry.gif border=0 align=middle>
Alan S

wheelzhavegone
Posts: 10
Joined: 05 Apr 2002, 07:52

Post by wheelzhavegone » 17 Apr 2002, 04:23

i havent done it yet, i was just thinking about it because i am sick and tired of getting 25 miles to the gallon out of it, which in the uk isnt cheap i can tell you! Are there any other options that can be recommended which are easier to solve this little problem???? :)

alan s
RIP 2010
Posts: 2542
Joined: 26 Jan 2001, 16:53
x 5

Post by alan s » 17 Apr 2002, 15:36

I am well aware of petrol prices over your way, here isn't much better with the prices varying on an almost daily basis and our general running costs not in proportion with disposable incomes.
I can only advise you based on my experience with a Citroen BX 16 Trs which I think has the same motor. When I bought it from a Citroen service agent (I mention that for a very good reason) it was getting around 14.5 to 15 litres to 100 klms. By contrast, a V8 4 wheel drive can run at around 16L/100klms so it was only slightly better. Upon close inspection, I found that several things had been done to "improve" the fuel consumption and performance. By reverting back to standard specifications, I ended up getting around 10L/100klms around town and a staggering 7.2L/100klms on the open road.
To achieve this I replaced the hose from the exhaust manifold to the air cleaner intake hose (which has a thermostatically controlled flap on it.) Checked the carb jets & discovered a 70 idle jet where a 45 should have been. Changed to premium unleaded petrol (dearer but vastly improved fuel consumption.) This also allowed an advancing of the spark (ignition) due to the higher octane rating. Fitted new air filter element and cleared all the blockages in the crankcase breathing system which in many cases feed through the carby. Checked & adjusted the float level in the carb.
Yesterday I drove one of my sons car, a BX 19 TZi on a round trip of almost 800 klms & it returned a consumption of 7.1L/100klms which should show that set up right, a carby car can almost achieve the same as an EFi one. My thoughts are that if you can regain the lost fuel consumption ability this is what you have to try & achieve. Don't work on the premise that you can improve on what was designed at the factory; it never works and in most cases the lost fuel consumption is caused due to something requiring servicing as described (air cleaner, missing hose, float level etc) or due to someone trying to improve things like removing a hose that does a critical job, changing jets or running on inferior fuel.
It's a process of elimination and has to be treated as such; service manual in one hand & then - carby.... ignition.... air supply to intake....& so on. Bit of time, bit of patience; you'll get there.
Alan S

35568968
Posts: 24
Joined: 02 Feb 2002, 09:13

Post by 35568968 » 23 Apr 2002, 01:57

well, I just sold my 405 1.6 it was a 1989 carb model, how you are getting such low mileage is unreal ! I was getting 35+ to the gallon, I strongly recommend you get your engine tuned by a local garage ! it should run a bit better !

35568968
Posts: 24
Joined: 02 Feb 2002, 09:13

Post by 35568968 » 23 Apr 2002, 19:48

Is this any good to you ? http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 1724946456 Just found it on a auction a BRAND NEW carb for £25 ? ? ? That's Good!