GTV 3.0 engine question

[Roon]

Hiya,

First let me introduce myself,
I'm Ronald and I live in the Amsterdam area ( yep, that's HOlland ).

First I owned a 1996 Alfa 155 1.8TS, but recently ( 3 weeks ago ) I bought a 1997 GTV 3.0 v6 24v Lusso. Man, what a car ! A dream on wheels. Oh and the milage is now 17.000km.
The first thing I did when I got it, was change the cambelt, build in a proper Class 3 alarm and the best radar detector I could get my hands on.


First all seemed fine. Now I'm starting to get to know the car, there's one thing which I noticed lately, It is that no matter if the engine is cold or well warm driven quite often during slow acceleration ( like in trafficjam or on the city ) it looks like A: the engine looses it's torque, B: sometimes it just misses a spark, C: the fuel intake is temp. less then normal.
It doesn't rev. up or down.
This phenomenen does not occur during fast accelerating i.e when I push the pedal to the floor.

Damn ! This is hard to explain !


Basicly it looks like I push the pedal in and out rapidly ( but I don't do that ) without the rev. needle going up and down, it's just that the want to start to hop.



I didn't notice this during the test drives / or it just started recently ( I really dunno ) .
The previous owner lives in Germany so there's no real warranty.

Please advice,
So I know what to tell the guys from the garage to look for, I know I might just as well tell them this whole story, but it would be appreciated if one of you guys could give me a clue.
Ronald

[Joachim]

I have the 2.5 V6 24V, which is not exactly the same engine, still close enough. But, in fact, the symptom you describe could befall any engine (of any make, too).

Here are some pointers:
- Fuel Injectors clogged
- Dirty/Faulty Air Mass Meter
- Lambda Probe with corroded contacts/faulty
- Fuel Pressure regulator faulty/clogged
- Throttle Flap dirty with Oil (from Blowby)

and, of course a combination of more than one problems. None of those are hard to fix, nor are they really costly.

That's what I could figure out, but it's even more difficult to
analyse the problem than it is to describe it over the distance and without seeing or hearing. Still, the most probable causes are those above.

Ciao,
Joachim

[Roon]

Hi Joachim,

Thanks for the reply,
I'll see if you're points can cure my error. As soon as I found it I'll let you know.

Regards
Ronald

[Roon]

It seemed to ba a loose wire of the sensor measuring the air / fuel mixture.

Well, I'm off for a spin now.


Regards
Ronald