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Author Topic: HELP. 2.5 running rough  (Read 5142 times)

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irratic

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HELP. 2.5 running rough
« on: 14 March 2007, 20:43:42 »
97 2.5 estate.. was running perfect.. it stood for about a month..flat battery.. put new one on. starts first time sounds sweet.. as it starts to warm up it seems to miss. not all the time. ticks over perfect no missfire.. as it gets up to temperature as you're driving ,every time you accelerate it seems to miss. hold at a set speed it seems to be fine.. no oil anywhere near plug leads. sparkplug holes clean..  there does seem to be air sucking it at the top of the engine at the rear. ( but my car sounds the same and runs fine) now the vacuum diverter valve that is at the front of the engine, in between the two big air ducts moves on my car when i rev. on this one it doesn't, is it supposed to when you rev??? any other ideas would be appreciated as i've been trying sort this for a week.. and there is no EM light . it comes on when the ignition is first turned on, goes off and doesn't even flicker..thanks
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TheBoy

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Re: HELP. 2.5 running rough
« Reply #1 on: 14 March 2007, 21:05:43 »
My initial reaction is something HT...
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Bo Bo

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Re: HELP. 2.5 running rough
« Reply #2 on: 14 March 2007, 21:19:46 »
You might want to have read through this thread, I have a similar problem, it may give you some ideas.....
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STMO123

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Re: HELP. 2.5 running rough
« Reply #3 on: 14 March 2007, 21:26:35 »
Quote
97 2.5 estate.. was running perfect.. it stood for about a month..flat battery.. put new one on. starts first time sounds sweet.. as it starts to warm up it seems to miss. not all the time. ticks over perfect no missfire.. as it gets up to temperature as you're driving ,every time you accelerate it seems to miss. hold at a set speed it seems to be fine.. no oil anywhere near plug leads. sparkplug holes clean..  there does seem to be air sucking it at the top of the engine at the rear. ( but my car sounds the same and runs fine) now the vacuum diverter valve that is at the front of the engine, in between the two big air ducts moves on my car when i rev[/highlight]. on this one it doesn't, is it supposed to when you rev??? any other ideas would be appreciated as i've been trying sort this for a week.. and there is no EM light . it comes on when the ignition is first turned on, goes off and doesn't even flicker..thanks

Sounds like the font multiram is not working, but that should result in no pickup above 4000rpm, not a misfire. Maybe a vac pipe off at rear of engine?

Marks DTM is the expert.
« Last Edit: 14 March 2007, 21:30:36 by STMO123 »
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irratic

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Re: HELP. 2.5 running rough
« Reply #4 on: 14 March 2007, 21:32:34 »
the front multiram doesn't move... i'm still workiong on the car now..there is a vaccum to the solenoid at the back of the multiram. but disconnect it and rev the engine i get no vaccum that would go to the front multiram.. and yes it will rev abouve 4000 quite easily.. neither can i see the multi ram at the top rear of the engine (the one in the middle of the cam head) moving either . can someone confirm if they should be seen moving while revving the engine?? thanks
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STMO123

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Re: HELP. 2.5 running rough
« Reply #5 on: 14 March 2007, 21:36:17 »
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STMO123

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Re: HELP. 2.5 running rough
« Reply #6 on: 14 March 2007, 21:38:14 »
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Bo Bo

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Re: HELP. 2.5 running rough
« Reply #7 on: 14 March 2007, 21:40:39 »
Quote
the front multiram doesn't move... i'm still workiong on the car now..there is a vaccum to the solenoid at the back of the multiram. but disconnect it and rev the engine i get no vaccum that would go to the front multiram.. and yes it will rev abouve 4000 quite easily.. neither can i see the multi ram at the top rear of the engine (the one in the middle of the cam head) moving either . can someone confirm if they should be seen moving while revving the engine?? thanks
This was the advice I got regarding this.

with a running warm engine ... blip the throttle, the rear multiram valve should move ... if you blip it again - but harder and further, the front one should move - but you do need to do it "fast and hard" (missus) ... alternatively, the valves can be manually activated using a tech2 tester ...
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irratic

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Re: HELP. 2.5 running rough
« Reply #8 on: 14 March 2007, 21:48:22 »
ok.. thanks folks.. so basically i should see some movement... which at the moment i'm not... so firstly would these not working for whatever reason give me the symtoms i'm getting or is it a different problem??? and as i seem to have vaccum to the solenoids and its controlled by the ecu ,does that mean the ecu is buggered? ??? or something else??? ie , a fuse somewhere??? and if the ecu has gone down and put it in a form of lomp mode wouldn't the EM light come on?????
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STMO123

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Re: HELP. 2.5 running rough
« Reply #9 on: 14 March 2007, 21:54:16 »
Dont be thinking ECU just yet. Try and check that all the vac pipes are connected and in the right place.
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TheBoy

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Re: HELP. 2.5 running rough
« Reply #10 on: 14 March 2007, 21:54:52 »
The multirams not working will make it seem a bit flatter at low revs, but won't cause a misfire...
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STMO123

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Re: HELP. 2.5 running rough
« Reply #11 on: 14 March 2007, 22:00:20 »
Not sure if he's decribing a misfire.... :-/
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irratic

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Re: HELP. 2.5 running rough
« Reply #12 on: 14 March 2007, 22:00:55 »
just rechecked and neither multiram is working.. but have vacuum up to the solenoids... it runs flat alright , don't suppose an ecu off a 3litre will fit just to try it?????? just so happens ive got one lying around..
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TheBoy

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Re: HELP. 2.5 running rough
« Reply #13 on: 14 March 2007, 22:03:41 »
Quote
just rechecked and neither multiram is working.. but have vacuum up to the solenoids... it runs flat alright , don't suppose an ecu off a 3litre will fit just to try it?????? just so happens ive got one lying around..
Unlikely to be ECU.  Won't work anyway unless you have matching immobiliser (or a tech2)
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irratic

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Re: HELP. 2.5 running rough
« Reply #14 on: 14 March 2007, 22:04:30 »
perhaps its not quite a missfire in the term... while driving it seems to miss, yes .. but perhaps more like the old carb cars used to if they were fuel starving when you were accelerating... i really just put it down to a missfire... non of the vaccum pipes have been touched since the car was running fine...
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