3.1 engine ignition(?) problem

Have a flashing light? Gauges acting funny? Bad idle? Get your problems solved...
User avatar
michi
Registered User
Posts: 522
Joined: Sat Mar 08, 2008 5:38 pm
Location: Austria
Contact:

Re: 3.1 engine ignition(?) problem

Postby michi » Wed Jan 28, 2015 2:02 pm

So guys... after replacing the whole ignition, new FPR and ultrasonic cleaned injectors i still have the same problem. After after i swapped back in the injectors and FPR i thought it was better... i started it and it sounded waaay better and reeved up waaay smoother. I was let it idle and took it for a testdrive... it had its old power again and everything seemed fine. Then i let it idle before i parked it and i listend to the idle sound and noticed it idles like before i swapped these parts... took it again for a testdrive and noticed its got less power than before... couldnt even spin the tires when doing a WOT at low speed in first gear.

I got a video of its idle on youtube.
https://www.youtube.com/watch?v=kA25Wo8wFE4&x-yt-ts=1422411861&x-yt-cl=84924572

When the engine is cold it doesnt idle like that and sounds way more healthy. This was recorded when the engine was warmed up for like 5 minutes. Cant tell if it does make more power when its cold though...

Any more suggetions what could cause this problem? I want to get this thing fixed and get my inspection done... emissions are WAAY off.



User avatar
1988GTU
Registered User
Posts: 2744
Joined: Sat Mar 23, 2002 1:06 pm
Location: A town up north
Has thanked: 18 times
Been thanked: 11 times

Re: 3.1 engine ignition(?) problem

Postby 1988GTU » Wed Jan 28, 2015 2:56 pm

Fuel Pump has to be the culprit unless the fuel filter is swelling up.


_________
Image
-------------

User avatar
michi
Registered User
Posts: 522
Joined: Sat Mar 08, 2008 5:38 pm
Location: Austria
Contact:

Re: 3.1 engine ignition(?) problem

Postby michi » Wed Jan 28, 2015 4:14 pm

Planned to get my new filter swapped in anyways but havent thought about the fuel pressure... thanks for the tip. Going to get this checked tomorrow.



User avatar
Money pit Beretta
Registered User
Posts: 6353
Joined: Thu Jul 26, 2007 11:36 am
Location: Kansas
Has thanked: 2 times
Been thanked: 8 times

Re: 3.1 engine ignition(?) problem

Postby Money pit Beretta » Wed Jan 28, 2015 7:37 pm

Damn, I said fuel pump long ago. Should have stuck with that, but I go after the easy stuff first. Ok, for some the fuel pump is easy. Not me!
Can you have the pressure checked? Stock crank sensor still in there?


keep'em flying!

User avatar
michi
Registered User
Posts: 522
Joined: Sat Mar 08, 2008 5:38 pm
Location: Austria
Contact:

Re: 3.1 engine ignition(?) problem

Postby michi » Thu Jan 29, 2015 1:25 pm

Stock crank sensor, yes. My buddy has a fuel pressure tester but not the right adapter to get it on the pressure relief valve... damnit. But what wonders me... if the pump is the problem, wouldnt the engine run lean instant of rich?
Also, i tried to find my old o2 sensor but i cant find it... lol. And If i disconnect the o2 wire.. i guess it will run normally when cold and will run in loop mode after the engine warmed up, right?



User avatar
3X00-Modified
Administrator
Posts: 10657
Joined: Thu Jul 05, 2007 9:18 am
Location: Plainfield CT
Has thanked: 12 times
Been thanked: 46 times

Re: 3.1 engine ignition(?) problem

Postby 3X00-Modified » Thu Jan 29, 2015 1:47 pm

Out of all of this have you tried changing the coolant temp sensor? It sounds like it's reading a low coolant temp which would revert the engine into ultra rich mode...



User avatar
ifixalot
Registered User
Posts: 531
Joined: Tue Dec 26, 2006 10:56 am
Location: Deerfield Illinois
Been thanked: 12 times

Re: 3.1 engine ignition(?) problem

Postby ifixalot » Thu Jan 29, 2015 1:51 pm

Something to check, do you have a firewall leak on the passenger side?
That could cause corrosion on the terminals to the ECM.
Check that they are clean and not all greenish.
All the engine sensors go into the ECM there.
My daughter's 90 had an intermittent high idle and corrosion there was the cause.



User avatar
1988GTU
Registered User
Posts: 2744
Joined: Sat Mar 23, 2002 1:06 pm
Location: A town up north
Has thanked: 18 times
Been thanked: 11 times

Re: 3.1 engine ignition(?) problem

Postby 1988GTU » Thu Jan 29, 2015 1:52 pm

3X00-Modified wrote:Out of all of this have you tried changing the coolant temp sensor? It sounds like it's reading a low coolant temp which would revert the engine into ultra rich mode...



If his fan is constantly on, it would make sense to be the CT sender.


_________
Image
-------------

User avatar
michi
Registered User
Posts: 522
Joined: Sat Mar 08, 2008 5:38 pm
Location: Austria
Contact:

Re: 3.1 engine ignition(?) problem

Postby michi » Thu Jan 29, 2015 3:51 pm

Do not have a firewall leak in my car but will double check that for sure and check the ECM.
And yeah, water temp sensor is still the stock one... too bad i always have to wait a week or even more to get new parts... that kinda annoys me and also why i cant find out whats the problem...

Too bad the computer doesnt throw any codes, that would be too easy to find out wheres the problem :)



User avatar
3X00-Modified
Administrator
Posts: 10657
Joined: Thu Jul 05, 2007 9:18 am
Location: Plainfield CT
Has thanked: 12 times
Been thanked: 46 times

Re: 3.1 engine ignition(?) problem

Postby 3X00-Modified » Thu Jan 29, 2015 8:47 pm

If you had a tool to read the ecu data that would help immensely.



User avatar
michi
Registered User
Posts: 522
Joined: Sat Mar 08, 2008 5:38 pm
Location: Austria
Contact:

Re: 3.1 engine ignition(?) problem

Postby michi » Fri Jan 30, 2015 12:13 am

I have tunerpro on my laptop but couldnt find anything whats wrong. Did some recordings of my idle and wot too but honestly i cant do much with all these values.. haha :D



User avatar
3X00-Modified
Administrator
Posts: 10657
Joined: Thu Jul 05, 2007 9:18 am
Location: Plainfield CT
Has thanked: 12 times
Been thanked: 46 times

Re: 3.1 engine ignition(?) problem

Postby 3X00-Modified » Fri Jan 30, 2015 6:01 am

What are the readings? Ask around we'll tell you what to log and then post that info... That will help a lot.

For one that will rule out the Coolant Temp sensor if you have a reading in the ecu that is correct.



User avatar
michi
Registered User
Posts: 522
Joined: Sat Mar 08, 2008 5:38 pm
Location: Austria
Contact:

Re: 3.1 engine ignition(?) problem

Postby michi » Sat Jan 31, 2015 6:03 am

Heres a quick pic of my datalog of my beretta idling (warm). I have some dataloggin files around but will take even more if needed.

Heres the warm idle file
http://www.file-upload.net/download-10233048/idle-warm.xdl.html

and WOT
http://www.file-upload.net/download-10233054/WOT.xdl.html
Attachments
beretta.jpg



User avatar
ifixalot
Registered User
Posts: 531
Joined: Tue Dec 26, 2006 10:56 am
Location: Deerfield Illinois
Been thanked: 12 times

Re: 3.1 engine ignition(?) problem

Postby ifixalot » Sat Jan 31, 2015 11:01 am

I'll let someone more knowledgeable comment on your readings.
I'm curious if you ever checked the injectors with an ohms meter?



User avatar
michi
Registered User
Posts: 522
Joined: Sat Mar 08, 2008 5:38 pm
Location: Austria
Contact:

Re: 3.1 engine ignition(?) problem

Postby michi » Sat Jan 31, 2015 2:19 pm

No i didnt ohm'ed them out...wish i would have but forgot about that. I just got power on them to see if they "klick"...




Return to “Diagnostic Help”

Who is online

Users browsing this forum: No registered users and 8 guests