General Tipo update

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General Tipo update

It's one of those things where you need someone "in the know" with experience of that era Fiat and time to have a good poke about and think, with a methodical approach. A normal auto-electrician may be useful but won't be able to do a full analysis of the car, similarly an old-school mechanic may not have all the gadgets for a full checkover.

You could consider checking or changing the inlet manifold temp sensor if you think it's temperature-related ...

http://www.ebay.co.uk/itm/BOSCH-Coo...l:Tipo&hash=item1ea669a042:g:OUMAAOSw~bFWM2nM

(non-Bosch ones are around £10)

I've had issues with mine in the past.

Have you had the car's ECU diagnosed? It's an early type so doesn't really give dashboard warnings and detailed fault reports, but some faults with wiring or sensors should be stored and would give a clue.

There's always the chance that recent poking around and repairs have slightly disturbed something that was a bit flaky, so that's something to check. It seems to me that it's a sensor going to the ECU that is confusing it, possibly it could be something around the plug leads / distributor so double check those.

I can't remember if you've done anything to the lambda sensor in the exhaust, but those affect the running and likewise an exhaust leak around the lambda.

Remember that these were still simple cars with a good established engine that received some modernisation, so it should be fixable with internet information and parts suppliers....
 
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In the old days your symptoms might have been blamed on a blocked jet in the carb, and you'd have investigated there. With the electrinic throttle body setup I guess that doesn't apply, but there are probably things to check or clean if you're in the know before you try to change the whole unit.

It depends on exactly what the garage did to diagnose it, and whether it ran OK recently until something changed.

Anyway there's no reason to scrap the car... worst case sell it as "spares or repair".

Keep at it....
 
Oh yes, not scrapping it that's the last resort, I want to fix it but without the knowhow its frustrating.
I had a word with the garage bloke and he said that he stripped it down and checked it over and it's knackered, so I need to change the whole unit.
Something about a sealed unit that cannot be changed?????
He said its not injecting properly???
I don't know, this is what I was told, so I was looking for a complete unit, which I couldn't find.
I even thought could a unit fit from another model like a punto or something????

I will have a look myself at the weekend to see if there is anything that looks odd!

On another note, the alternator light on the dashboard has been coming on and I've noticed that when the lights are on the dashboard light for the lights flickers????
Could this have anything to do with it????

Cheers Bluejohn for all your help mate.
 
Hi Bobbylad,

Useful to know that your garage guy had a good look at it and is confident in what the problem is... even though it may be a bit tricky to fix.

You should start a new thread about the Mk2 Tipo / Tempra injection system, and specifically how you can find a replacement unit.

I think the injection unit MAY be different between the Tipo / Tempra 1.4 and 1.6, I know the overall ECU/EFI combination is different.

My manual (P164) lists the 1.4 (and 1.6 auto) as having "Bosch <<Mono-Jetronic>> single point injection (S.P.I.)",

and the 1.6 manual as having "Single point 'Bosch Mono-Motronic MA 1.7' electronic injectiion, with integrated ingnition control (S.P.I.)"

However... the final "revised" Mk2 Tipos (like my blue one" had an upgraded ECU setup, which MAY be effectively the same as the 1.6 manual version, however My slightly earlier silver one had your setup with the distributor and bulkhead-mounted ECU (which I have still got if you needed to swap or test).

I believe some of these were also used in 90s Citroens (Xantia maybe).

The good news is that the 1.4 Mk2 Tipo was pretty popular so if you hunt around you might still find one in a scrapyard somewhere... many will have been scrappaged a few years ago or junked when a neglected cambelt failed.

Keep investigating and maybe get a second opinion? As I said before, sensors / wiring are the usual starting point, followed by coilo / leads / plugs, mechanicals (air leaks), maybe ECU and then the injection / injector(s) itself.
 
Cheers Bluejohn,
I had a little poke around yesterday but with my little mechanical knowledge I didn't get far. I checked all the things that plugged into it, checked wires and just looked if anything had popped off or was hanging.
It may have been my imagination or wishing but it seemed to run a bit better after I wiggled things etc.????
If you know of anyone or anywhere that may have the SPI for sale give me a shout, I've looked on ebay for a SPI but nothing on there for a 1.4 Tipo????
Cheers
Bob
 
I dont know if this is relevant but according to a fiat technical bulletin the mono jetronic spi system will not operate correctley if the throttle closed microswitch is incorrect adjusted , I could scan this for you if you want to give me your e mail ?
 
I spoke to my neighbour last night and his mate who's got a garage is going to look at for me if I can get it to him on Saturday after lunch.
For Free so I will take him up on that offer and see what he comes up with????
 
I found this stuff about the system...

Wikipedia:

Mono-Jetronic (1988–1995)

Digital fuel injection. This system features one centrally positioned fuel injection nozzle. In the US, this kind of single-point injection was marketed as 'throttle body injection' (TBI, by GM), or 'central fuel injection' (CFI, by Ford).

Mono-Jetronic is different from all other known single-point systems, in that it only relies on a throttle position sensor for judging the engine load. There are no sensors for air flow, or intake manifold vacuum. Mono-Jetronic always had adaptive closed-loop lambda control, and due to the simple engine load sensing, it is heavily dependent on the lambda sensor for correct functioning.

The ECU uses an Intel 8051 microcontroller, usually with 16 kiB of program memory and without advanced diagnostics. (OBD-II became a requirement in model-year 1996.)

Fiat Forum:

https://www.fiatforum.com/uno/10041-bosch-mono-jetronic.html

Basically check that mechanical things aren't stuck, blocked or leaking, and that electrical things (actuators, sensors) haven't failed or developed dodgy wiring.

Lambda sensor is always a favourite, and an original catalytic converter could have failed or blocked. Check that the crank breather hose from the front of the engine up to the airbox isn't gunked-up (remove the adaptor at the bottom). And get the ECU diags read!

I'm sure you'll crack it by a process of elimination.
 
Cheers Bluejohn and Michael for help and info, I'll see what happens at weekend???
 
Hi, I've been on holiday for a week and a bit so not been on here!
While I was away I had a new alternator fitted, dizzy cap and rotor arm as I was told this would rectify the problem, it hasn't!!!!!!!
It's running better, but still got the running issue, I'm going to have one more crack at it by replacing the sensor.
If this doesn't do it I'm putting it up for sale.
I cannot keep throwing money at it, another £100 has gone on it to sort this out and I'm falling out of love with this car fast.
 
I've been into the garage again for a check up and as Bluejohn suggested it could be one of two things, the idle control throttle / position sensor?
The garage chap said he was out and about Tuesday (today) at a couple of scrap yards and thinks he may have seen a complete unit in york???
I'm waiting to hear from him to what will be the next move?
If no replacement unit I'll get the sensors, he said he may be cheaper to put on a second hand complete unit from scrap yard rather than buying new sensors????

I will keep you updated.

Yes Bluejohn still interested in the parts, message me with prices???

Bob
 
Still plodding on in my old Teapot, I think it is the Throttle Position Sensor for what I've been told.
It judders a little mainly after giving it some beans and at low speeds.
Still doing it and using it every day averaging 200 miles a week.
Still trying to find a replacement part for it, but with not much success at present.

I'd just like to say a big thank you to eveyone who helped with problem.
 
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