Dorset Ranger

Active Member

• Aug 21, 2018

• #1

Hi guys,


My 1999 4.6 v8 (Thor) starts but almost immediately dies. here are some details, please help if you can!


1. The amount of time it stays alive for can vary from one to ten seconds.

2. The engine seems to run lumpy as I’m experiencing a lot of shake particularly as it dies.

3. The revs fluctuate and it runs below normal idle speed.

4. The battery is fully charged.

5. It has fuel!

6. Trying to increase revs once it fires seems to impound the problem.

 

wammers

No longer with us, RIP

Donater

• Aug 21, 2018

• #2

Unplug the MAF sensor then start. If it runs and does not cut out MAF sensor is duff.

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #3

Tried that no dice

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #4

If its starts and stays alive, when i try to pick the revs up from idle, it kills it alomst straight away.

 

wammers

No longer with us, RIP

Donater

• Aug 21, 2018

• #5

Dorset Ranger said:

If its starts and stays alive, when i try to pick the revs up from idle, it kills it alomst straight away.

Click to expand...

Is that with MAF connected or disconnected?

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #6

Both!

 

wammers

No longer with us, RIP

Donater

• Aug 21, 2018

• #7

Dorset Ranger said:

Both!

Click to expand...

Does it stay alive with MAF disconnected until you press throttle? If it does the MAF is duff.

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #8

No, symptoms are the same with it connected or disconnected

 

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Full Member

• Aug 21, 2018

• #9

Idle Air Control Valve??? Split induction pipework/ducting???

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #10

Just noticed a humm and vibration from the throttle body unit and adjoining manifold with the ignition on

 

wammers

No longer with us, RIP

Donater

• Aug 21, 2018

• #11

Saint.V8 said:

Idle Air Control Valve??? Split induction pipework/ducting???

Click to expand...

Yep if the MAF checks out looks like he has a bit of work to do.

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #12

Actually it’s coming from the round cylinder that has the two hoses connecting to either side of the TBU (green BOSCH sticker on it)

 

wammers

No longer with us, RIP

Donater

• Aug 21, 2018

• #13

Dorset Ranger said:

Actually it’s coming from the round cylinder that has the two hoses connecting to either side of the TBU (green BOSCH sticker on it)

Click to expand...

That will be the idle control unit.

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #14

Would make sense to me given the fluctuations. Easy fix to replace?

 

wammers

No longer with us, RIP

Donater

• Aug 21, 2018

• #15

Dorset Ranger said:

Would make sense to me given the fluctuations. Easy fix to replace?

Click to expand...

Does it look like this? https://rimmerbros.com/Item--i-ERR6078P

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #16

Just swap it out then?

 

wammers

No longer with us, RIP

Donater

• Aug 21, 2018

• #17

Dorset Ranger said:

Just swap it out then?

Click to expand...

You could try cleaning it.

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #18

Thanks guys, will give it a go

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #19

Any idea how to undo the hose clips?

 

Dorset Ranger

Active Member

• Aug 21, 2018

• #20

Done it, bravery!