Soarer Central: Help Car Spitting & Spatting

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Joe Aliano
Tinkerer
Nsw
91 UZZ31 Soarer , 2004 CV8-R Monaro

Posts: 43
Reg: 08-2005

Rating: N/A
Votes: 0 (Vote!)

Monday, March 06, 2006 - 09:03 pm, by: Joe Aliano (Sexylexus)

Hello All,

I am experiencing a small problem with the wife’s UZZ31 (No EMV) , a few weeks ago while driving at cruise speeds the car decides to misfire and bog down….then all of a sudden it picks up again and when I went to accelerate it was really struggling.

I then turned around to come back home and when I finally made it I sent Neil an email asking for his advise and he kindly suggested that I do the following which I did

FP to b+ Bridge to determine if it’s the fuel pump & run an Engine Diagnostic

The first time I ran the diagnostics it came up with error 31…. when I rectified that fault I thought the problem was solved but then a few ours later the same thing again, Then finally yesterday it got to the point where is actually died taking off from a set of lights. Thank god it started up again.

So aside from the obvious (Fuel Pump) what else could it be?

Thanks

Joe

Graham Dollisson
DieHard
QLD
GT-TL

Posts: 656
Reg: 07-2005

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Votes: 0 (Vote!)

Monday, March 06, 2006 - 09:11 pm, by: Graham Dollisson (Alloyvee)

Did you actually do the FP to b+ bridge?

Dan McColl
DieHard
Victoria
UZZ-32 V8 Soarer #138

Posts: 764
Reg: 07-2005

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Votes: 0 (Vote!)

Monday, March 06, 2006 - 09:35 pm, by: Dan McColl (Hoon)

Coils, Igniters, Leads, Ecu, Oxy Sensors, and the list goes on.

Run full engine diagnostics and see if it comes up with anything.

Diagnostics here.

Mark Paddick
Goo Roo
ACT
Soarer UZZ31

Posts: 2024
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Monday, March 06, 2006 - 10:45 pm, by: Mark Paddick (Sparks)

Ya forgot the airflow meter Dan

(V8s only)
The big problem is that if the ECU is faulty then the diagnostics can be totally meaningless.
This doesn't mean that they're not worth doing but don't blindly believe them either.
There is a relatively common ECU fault that can do this. It will get more common too.
One thing a lot of people forget is the most simple of all, the fuel filter. If there is a lot of crud in the tank it gets sucked up against the filter which does it's job and won't let it through. This then blocks the filter, car runs rough, missing etc. You stop, crud falls back off the filter surface and car starts up OK and runs OK for a while....then stops again when filter blocks up.... and on and on add infinitum. All sorts of factors can affect the period that the car will run for, from a minute or two to a few hours. There is no diagnostic code for this condition either

Kierin Woods
Tinkerer
Queensland
V8

Posts: 30
Reg: 08-2005

Rating: N/A
Votes: 0 (Vote!)

Monday, March 06, 2006 - 11:13 pm, by: Kierin Woods (Lexsc400)

Sounds exactly like what my car has been doing. Replaced the leads, nothing, replaced the 2000km old NGK Iridium plugs, nothing.

THink it may be a fault with the AFM. Cleaned the terminals, plugged it back in, much better, not perfect, but much better.

Mark Paddick
Goo Roo
ACT
Soarer UZZ31

Posts: 2040
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Tuesday, March 07, 2006 - 01:35 am, by: Mark Paddick (Sparks)

I have seen a car that had diagnostic errors saying AFM. It was in fact the ECU.

Katrina Bruns
TryHard
SD
Cobalt LS 2.2 L

Posts: 274
Reg: 08-2005

Rating: N/A
Votes: 0 (Vote!)

Tuesday, March 07, 2006 - 05:39 am, by: Katrina Bruns (Katrina)

This may help.. most likely not.. but worth a long shot. When I had my dash out for blinki dash repair.. my car would do the stall at stop lights and back fire frequently. Not saying your dash is out .. but if there is anything wrong with it.. it may cause problems else where. All those little chips and things in there completely affect the entire car.
Any of this making sense to anyone besides me?

Mark Paddick
Goo Roo
ACT
Soarer UZZ31

Posts: 2047
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Tuesday, March 07, 2006 - 09:19 am, by: Mark Paddick (Sparks)

Yes. I've seen V8's with TT dash's in them that do strange stuff.

Mark Paddick
Goo Roo
ACT
Soarer UZZ31

Posts: 2048
Reg: 07-2005

Rating: N/A
Votes: 0 (Vote!)

Tuesday, March 07, 2006 - 09:22 am, by: Mark Paddick (Sparks)

The AFM is easy to check with a multimeter for the 5V supply and CRO for the output.

Joe Aliano
Tinkerer
Nsw
91 UZZ31 Soarer , 2004 CV8-R Monaro

Posts: 44
Reg: 08-2005

Rating: N/A
Votes: 0 (Vote!)

Tuesday, March 07, 2006 - 09:47 pm, by: Joe Aliano (Sexylexus)

Graham Dollisson wrote on Monday, March 06, 2006 - 09:11 pm:
Did you actually do the FP to b+ bridge?

Yes I did the bridge nothing changed

Dan McColl wrote on Monday, March 06, 2006 - 09:35 pm:
Coils, Igniters, Leads, Ecu, Oxy Sensors, and the list goes on.

Run full engine diagnostics and see if it comes up with anything.

I did run the diagnostics and no error came up.

Mark Paddick wrote on Monday, March 06, 2006 - 10:45 pm:
One thing a lot of people forget is the most simple of all, the fuel filter. If there is a lot of crud in the tank it gets sucked up against the filter which does it's job and won't let it through. This then blocks the filter, car runs rough, missing etc. You stop, crud falls back off the filter surface and car starts up OK and runs OK for a while....then stops again when filter blocks up.... and on and on add infinitum. All sorts of factors can affect the period that the car will run for, from a minute or two to a few hours. There is no diagnostic code for this condition either

That sounds like a plan Mark and matches the symptoms to a tea

, I'll get it checked out.

Thanks everyone

Charlie Hooper
TryHard
Queensland
V8 Limited Soarer

Posts: 164
Reg: 10-2005

Rating: N/A
Votes: 0 (Vote!)

Wednesday, March 08, 2006 - 06:10 pm, by: Charlie Hooper (Charlie)

Joe,

Does the car drive ok over a certain RPM? I'm having a problem with my car running like a tank upto 3200rpm, over that everything seems fine. Even when I'm in nuteral and give it some revs it takes maybe 5 seconds to get upto 3200rpm then after that it revs freely. Keep us upto date with what happens with your car please

Joe Aliano
Tinkerer
Nsw
91 UZZ31 Soarer , 2004 CV8-R Monaro

Posts: 45
Reg: 08-2005

Rating: N/A
Votes: 0 (Vote!)

Sunday, March 12, 2006 - 09:35 am, by: Joe Aliano (Sexylexus)

All fixed... I changed the Fuel Filter and now all is OK.

Charlie ,

At first I thought the problem might be related at certain revs but the symptoms were fairly sporadic which is why I guess Marks suggestion regarding the Fuel Filter was right on the money.

Thanks All for your input

Joe Aliano
Tinkerer
Nsw
91 UZZ31 Soarer , 2004 CV8-R Monaro

Posts: 46
Reg: 08-2005

Rating: N/A
Votes: 0 (Vote!)

Tuesday, March 14, 2006 - 08:49 pm, by: Joe Aliano (Sexylexus)

Kierin Woods wrote on Monday, March 06, 2006 - 11:13 pm:
Sounds exactly like what my car has been doing. Replaced the leads, nothing, replaced the 2000km old NGK Iridium plugs, nothing.

THink it may be a fault with the AFM. Cleaned the terminals, plugged it back in, much better, not perfect, but much better

You were correct Kierin it was a faulty AFM connection