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rough/lumpy idle? PROBLEM FOUND! 

 

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Posted: Wed May 11, 2005 7:43 pm 
Getting Side Ways
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I got a spare set of injectors if you need them mate and map sensor
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Posted: Wed May 11, 2005 7:49 pm 
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im runnin a thing of injector cleaner through it atm, after this weekend, i dont have much time atm as my grandfather jsut passed away this week so i wont have time to look this week/weekend but next weekend i will get in and have a look and clean everything

thanks heaps for all your input!

 

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Posted: Wed May 11, 2005 7:50 pm 
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ItchiOne wrote:
In my case, my coil pack was intermittanty dropping spark to cylinder 3 and hense idle was poor.
Strangly enough, it seemed to come good once the revs increased.

Simplest procedure to test your leads and coil pack is:

1. pull of one lead off a spark plug,
2. connect this lead to a spare spark plug with the gap set to 6mm,
3. earth this plug,
4. Start you engine and check for a strong healthy spark,
5. switch off you engine, go to the next lead and start your engine,
6. do each other lead in turn.

If the above test doesn't show any problems, you can try removing one lead at a time from each spark plug with engine running. If RPM doesn't drop, then that plug is stuffed. Note that this may cause high induced voltage spikes in your electrics and i think ford does not recomend this (others on the forum can make comment if this test is considered unsafe for the car). Oh, and if you don't use insulated lead pullers, you may get a big zap :)

Cheers.


i mite give this a go actually cause as i said the car is still pullin as hard as ever, but just on idle it feels as if a cylinder is droppin out! cheers bud

 

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Posted: Wed May 11, 2005 8:06 pm 
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vacuum leak?

 

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Posted: Wed May 11, 2005 9:55 pm 
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Pulco wrote:
im runnin a thing of injector cleaner through it atm, after this weekend, i dont have much time atm as my grandfather jsut passed away this week so i wont have time to look this week/weekend but next weekend i will get in and have a look and clean everything

thanks heaps for all your input!
All the best dude!.

 

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Posted: Thu May 12, 2005 1:52 pm 
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If its a vacuum leak your car will be as lumpy as a 351 - sounds sorta ok, but not good! lol. Also i have noticed when I unpluged a vacuum plug the exhaust throws out a darker tinge smoke - does this happen to you at all?

 

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Posted: Thu May 12, 2005 2:20 pm 
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Mine sounds like a V8 but it is more like a piss weak 253 than a lumpy 351. And yes my new stainless exhaust tip is covered in a dark coloured exhaust dirt.
I am going to try cleaning the ISC first but the vacuum leak was my guess.
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Posted: Sat May 14, 2005 1:04 pm 
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hye guys,
just got back from wollongong and i had a quick look see while i was down there, cleaned the isc, check leads check intake and everything
couldnt find anything

guna pull plugs out today and check them, if its the plugs im guna be p****d, wasted $132 on iridium plugs just to break down...wont be happy if it is that

just checked plugs, gaps were a little small but ok, i made them to be 1.1mm

so yea, its not as bad but still there... :x

 

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Posted: Sun May 15, 2005 8:29 pm 
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Hey DALMO_501 .......

You suggested cleaning the TPS. Care to explain how you do this, cos I thought they were a sealed unit?
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Posted: Mon May 23, 2005 3:45 pm 
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ok i finally got time to get off my a*** and have a good look today and find out that i have a vacuum leak! and its a bastard of a one too, the intake manifold gasket has split! on the no. 6 cylinder! so now im guna have to replace that

wat is the best gasket to get? are there any differences between models from ef-au? like is there an intake manifold gasket like the au head gasket cause i dont wana have to change it again!

and anyone got an idea on price of the gaskets?

 

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Posted: Mon May 23, 2005 3:55 pm 
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I had the same problem myself - gasket busted near 6cyl. Only problem was when i changed it ran better but did not fix the problem. I just bought the standard gasket from Repco -dont know what brand it was.
It is a bit of a b**ch to get to the bolts holding the manifold on towards the back of the engine. Simple job but time consuming due to the location of some of the bolts.
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Posted: Mon May 23, 2005 3:58 pm 
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yea well im guna leave it til one arvo then get into it

guna completely pull aprt the intake manifold and replace all gaskets on that side

also guna get injectors cleaned too while its all out!

 

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Posted: Mon May 23, 2005 10:46 pm 
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so that is 10 points to me for suggesting a vacuum leak? ;)

Glad you found it!

 

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Posted: Mon May 23, 2005 10:53 pm 
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yea was guna say that!

fittin the new gasket and stuff tomorrow
let u know how i go with it

 

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Posted: Tue May 24, 2005 11:08 am 
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How exactly did you diagnose it as a vacuum leak? I also suffer the poor idle and that is one aspect i havent checked yet.

 

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