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Topic: Powerloss during acceleration (Read 637 times) |
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Hemulen
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Powerloss during acceleration
« on: Nov 16th, 2006, 7:18am » |
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Hi!
I'm a new Scorpio owner i Sweden with a few problems you pros might be able to help me with?
I hope you can understand my english 
Background:
Scorpio 2.0 8v estate 5 door HGV 1996 195000 km.
New sparkplugs, fuel filter, oil filter, air filter and syntetic oil. STP Injection cleaner.
Problem 1:
Engine "dies" if I try to accelerate to hard. But after a few minutes it's "OK". After disconecting MAF sensor the engine start "dying" under a shorter time. And after buying a new MAF sensor the shorter "dying" remains.
If I start the car and leave it the engine almost dies after a few minute, about the sametime it would have if I had drove away. I guess this is switching from open loop to normal?
Problem 2:
When accelerating with warm engine the power isn't coming in a even flow. It kind of feels like riding in a boat on the waves. It's almost if I push the accelerator and release it and push it and release it until I reach the speed I want. After about 4000 rpm it's no problem, but below 4000 rpm it is.
Problem 3:
I had the car in for a scan and they couldn't get in touch with the PCM. If it could have been scaned I would have known where to look.
Any ideas what can cause these problemes?
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Spannerdemon
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Re: Powerloss during acceleration
« Reply #1 on: Nov 16th, 2006, 7:47am » |
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Have a look at your ECU unit under your glove compartment. Disconnect the plug with a 10mm spanner, and make sure that all the pins are dry and sound. Water leaks into them through the grommet and down the loom behind the battery.
Causes exactly the problems that you're having.
Worth checking anyway. 
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Hemulen
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Re: Powerloss during acceleration
« Reply #2 on: Nov 16th, 2006, 7:55am » |
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I'll do that later this evning and get back to you!
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Hemulen
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Re: Powerloss during acceleration
« Reply #3 on: Nov 16th, 2006, 5:07pm » |
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How do you remove it 
I've removed the glove box and the black box above but I can't find any way to remove the ECU.
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Hemulen
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Re: Powerloss during acceleration
« Reply #4 on: Nov 16th, 2006, 7:00pm » |
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I used a drill and managed to remove it.
The connectors looked "moisty" so I gave them a good spray with electronic cleaner / moist remover, put it back together and took a testdrive.
Well, I didn't feel any changes, but I might have taken the testdrive to soon after spraying to connector so I will leave it until morning and do a new testdrive then.
I'll be back.
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Spannerdemon
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Re: Powerloss during acceleration
« Reply #5 on: Nov 17th, 2006, 5:17pm » |
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Quote:| I used a drill and managed to remove it. |
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Drill.............!!!
It's in a cradle just above and behind the glovebox. No tools are required. It just unclips.
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Jonnycab
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Former owner of 2.3 Ultima Facelift saloon
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Re: Powerloss during acceleration
« Reply #6 on: Nov 18th, 2006, 3:18am » |
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Spanners........I had to drill mine out also, because the cradle was riveted together & it would not come out unless the rivets were removed
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Jonnycab
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Former owner of 2.3 Ultima Facelift saloon
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Re: Powerloss during acceleration
« Reply #7 on: Nov 18th, 2006, 3:53am » |
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Hemulen.....I'm not that familier with the 8v 2.0, but it sounds like it could be an ignition problem.
You say you've replaced the plugs, but have you checked the plug leads & ignition coils? 
If the car feels like it is starved of fuel, then there is a good chance that the ignition coils may need replacing.
Dodgy coils give almost the same effect as fuel starvation.
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Hemulen
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Re: Powerloss during acceleration
« Reply #8 on: Nov 18th, 2006, 9:07am » |
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Hi again!
Now I have had my PCM cleaned again with som new electric cleaner and sleeping over night on a radiator so it would be 100% dry. I also had a radiator blowing warm air on the cables where the PCM is mounted over night. Now I mouted it all back in place and took the car for a new testdrive and the problems remains 
Ignition coils and plug leads hasn't been changed but I cleaned the plug leads and sprayed them with electric cleaner that suposed to keep moist away.
I will buy a new sets of coils and plug leads and give it a try.
Can there be a problem with my PCM so I need it replaced as well? I found one with a matching number on a scrap yard
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Hemulen
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Re: Powerloss during acceleration
« Reply #9 on: Nov 18th, 2006, 9:19am » |
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The help from my 2,5 year old son is't exactly helping.. 
Is there a way of checking the coils condition? I haven't seen any "flashes" around the plug leads while looking under the hood on a dark evening. The 8v 2.0 has 2 coils in front of the engine with all four leads fully visible.
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pappa
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VM Diesel 2.5Tdi 90kW
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Re: Powerloss during acceleration
« Reply #10 on: Nov 18th, 2006, 9:35am » |
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Hi there neighbor! (I'm from Finland)
The scan would be very important. Was it at a Ford dealer that you had it
scanned? Not all ISO scanners can do it, I purchased ElmScan5 which has
all the protocols in it and it worked for me. I had about the same sort of
a problem in my 24V. My catalysator's were broken and three out of four
H2O sensors were broken too. I replaced my catalysators and all of the
H2O sensors and got rid of that problem.
Have another idle issue to sort out though.
The symptoms were the same - accelerating was like someone was
pumping the gas pedal.
This is a theory: " A Catalysator cheramic elements can brake and the
catalysator can get clogged. This will prevent the exhaust gases from
flowing out in a normal manner, creating a 'gas plug' in to the exhaust
pipe. As a result, when the plug gets out, the car speeds up, when it
builds up, car slows down. This also leads to catalysator overheating
and due to that there's even a risk of fire in the engine room. "
That's my own theory, based on what I have experienced, but I have
no solid fact on this, sorry.
Take it to Ford and ask them to scan it. If they can't, then there could
be something wrong with the ODB II port/connections/ECU ...
Hopefully this gives you some ideas.
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My cars are the best and the pigs and cows fly.
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Hemulen
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Posts: 7
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Re: Powerloss during acceleration
« Reply #11 on: Nov 18th, 2006, 9:47am » |
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Hi there neighbor!
My car tried to be scaned at the Ford dealer in Linkoping Sweden called 'Forema' and they wasn't able to get in touch with the PCM.
Intresting teori with the catalysator...... I'll keep that in mind.
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