Misworking in idle only after replacing water pump

Hi!

I have a question for you (for my Eclipse 2.0 GS non turbo with automatic transmission):

Recently I replaced water pump and A/C-Power Steering belt + gasket for thermostat. When I got my car back, it is working a bit strange in idle - something like it doesn't run smoothly, but like it's been missing rpm, but it's not. Rpm is OK, usual as before. And if I just let him go (release brake pad) it doesn't run normaly but like someone is tugging or pulling it unevenly. This also does in reverse. But when I start pressing the gas pad (even just a little bit), it runs normally.

What might be the problem?

I Would start by looking all over the engine bay for a wire or vac line that may have been accidentally left disconnected during the above mentioned work that was done. Since a new water pump can't cause a bad idle, the work done to change the part is the most likely cause.

But what about timing belt? I heard that if timing belt is not properly set it might be the reason?! What do you think of that?

Definately check the timing. Hope-fully you have a timing light, or know someone who does.

Hmm. I suppose since you have to remove the tbelt to do a water pump, they could have screwed that up. Hopefully no one messed with the tension at least. If the cam timing is off, so will be the ignition timing. Line the crank up to the TDC mark, pop off the upper timing belt cover, and see if the cam gears are aligned using a straight edge through all 4 marks. Should be damn close. Let us know how that works out.

Definately check the timing. Hope-fully you have a timing light, or know someone who does.

First, I don't know what you mean by "timing light".
And second, I'm from Europe and this car is some kind of "exotic" here and no one has the light.... :(

A timing light is going to help you as much as a .45 to your skull. To verify if all is exact, you will need to remove the side motor mount, accessory belts, crank pully, and the plastic shield. Rotate the assembly until the crank sprocket's mark is lined up with the mark on the oil pump. Then check the Cams. Are the marks facing each other? I am willing to bet it is a tooth off from the sound of your problem.

I would do the test I suggested first, using the crank marks on the carnk pulley and the timing belt cover used when setting igitition timing (with that light). In some cases those marks have been known to be off, but it will still show if one of the cams is off a tooth, and literally takes 5 minutes to do, if that. If thats incomclusive, then I would take the time to pull that cover off, with all of the work that it entails. :)

I couldnt agree more. Start with the easy checks before you start taking things apart. I am also wondering, how did you end up with a DSM in europe?

"...I don't know what you mean by "timing light"." - GregsDefinition: A strobe light for checking ignition timing. The light is connected to the number one spark plug wire so every time the plug fires the light flashes. The light is then aimed at the timing marks on the crankshaft pulley or flywheel to read timing.

http://content.sears.com/data/product_images/009/21023/00921023000-dlv.jpg
Basic Timing Light

http://store1.yimg.com/I/rodi_1823_29736813
Digital Timing Light

These are pretty standard pieces of equipment and are essential when doing home auto repairs/maintenance/upgrades. Even if you could not find one in a European automotive parts store, you could buy one online. I'm certain your mechanic will have one as well.

Personally I would take the car back to the people who last serviced it and tell them that you've been having problems ever since your car was returned. If they broke it, then they're responsible for fixing it. If they're anything like American mechanics, they might try to sell you some part that mysteriously went bad at the exact same time they were working on your car. If that's the case, politely remind them that your car was working when you delivered it to them or that it had an unrelated problem. It's hard to win those arguments, but usually a persistent customer will win.

Incidentally, if you have trouble finding mechanics in Europe who are familiar with your car, then take it to the Mitsubishi dealership. In North America, DSM owners will try to avoid going to the dealer for repairs since they charge more than a private mechanic. However, you may not have as much of a choice. Of course, any mechanic who is familiar with EVO's should feel comfortable working on your DSM.

you definetly need a timing light. Also the water pump has its own marks that have to be lined up as well, your not going to see that with the cover on there. If you check the timing and wires and vacume lines and see no problem there then check that mark.
If that belt is even one tooth of from its mark it will cause improper working ability

Ok first of all... I told you to remove (not change) the link in your sig!


Second of all... You are wrong and stop posting what you dont know! The water pump sticks out through the timing belt cover and there is no marks on it! There are also no teeth on a water pump.

ok first off i can have a link there. second of all your not my dad. DO NOT tell me what to do, if this bothers you tell someone who cares. dont tell me or bring your personal vendentive out againt me on a site that the public can view.

Do you know that there is a goverment passed law that your breaking by doing so. i dont know the exact name but it has to do with ruining reputation/slander or however else you would like to word it.

GROW UP

Well, fuck it your banned! I'm sick of putting up with your shit.

I couldnt agree more. Start with the easy checks before you start taking things apart. I am also wondering, how did you end up with a DSM in europe?

Ok, short introduction to geography:
I am from Slovenia (neighbour country to Austria and Italy) and our Mitsubishi dealer hasn't imported any Eclipse in any time - just other Mitsu cars. So they don't even have any experience with with car and they don't even want to.
Germany, Austria and Italy are selling Eclipses (mainly with manual transmission), which are made for European market and therefore have right homologation. My car was imported from USA directly and it has automatic transmission. So I am having a bit of a problem sometimes to get proper "treatment" for my car. Fortunatelly I have a friend (mechanic) who can jelp me a lot, but he doesn't always have all necessary tools.

@ Diplomat:

Mechanic is a friend of mine so he will rebuild the timings again next week. He doesn't have this timing light, but he will match again all marks on the timing belt.