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90 Legacy: unusual engine problem
Posted 15 July 2003 - 07:58 PM
The car is a 1990 Legacy 2wd. L. automatic.157K miles
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Car will start and run like normal on initial start-up.
Idles up like it should, no gauges showing anything abnormal.
Check engine light does not illuminate.
When the car warms to operating temp, idle will drop as usual, fans will even come on if needed. All ancillary systems work.
You can drive it while it's warming up, no drop in power.
When the car gets to running temperature it breaks up very violently on throttle if moving or parked.
it will usually idle OK, small dabs of the throttle don't really get it missing (1500 to say, 2000 rpm) A sharp jab will cause it to miss and break up.
Trying to get it to rise slowly on throttle will cause it to miss too.
Cannot drive the car, Oh, you can put it in gear and it will idle against the brake but don't ask it to move. Throttle will kill it. Dies a slow jerky death if you don't let up.
If you turn the car off it will not start back up until it has cooled all the way down.
Check the codes. Nothing.
Drove the car around with the green connector connected. Nothing.
Parked in the driveway, and let it warm up until the problem arose. nothing on the ECU.
Timing belt and cam seals at 125K.
I change the oil regularly at 3000m.
Havent' done a good tune-up for quite a while(-+50K).
IVe got my wife driving the RX and I'm back to driving the 86 Hatch that I rallycross on the street again. Although this car is fun, commuting in it is getting to be a bit much.
I have a couple ideas but I don't want to prejudice someone elses guess with my own theories.( So far I've been wrong)
Any ideas on my problem with this car would be appeciated.
You can ask all the Q's you like, I'm watching the post close.
Email at firstname.lastname@example.org.
Posted 15 July 2003 - 08:14 PM
Last time you changed the wires?
Try running some fuel cleaner through or dry-gas.
Other thought would be coolant temp sensor, but it's not the normal behaivor. If you have a service manual of some kind, do some checking on the various sensors and see if they look normal.
Posted 15 July 2003 - 09:01 PM
Not to massage your ego, but I was hoping you would reply.
I figure no matter what the problem a good tune-up, and in that, I mean spark plugs, wires, air and fuel filter, PCV, and the like might not solve the issue at hand but would cross a few question marks of the list of probable causes.
what else am I forgetting with that tune-up?
Guess I could spring for an oxygen sensor too. Although pulling the plugs would answer that Q.
No service manual, but I do have an extra engine with a spun bearing for sensor swaps if need be. Not the best idea(old for old) but the most inexpensive.
Thanks for the reply,
Posted 15 July 2003 - 09:54 PM
Posted 16 July 2003 - 04:55 AM
Posted 16 July 2003 - 07:22 AM
Posted 16 July 2003 - 11:01 AM
Posted 16 July 2003 - 08:17 PM
Posted 16 July 2003 - 09:02 PM
Posted 17 July 2003 - 06:50 AM
Posted 17 August 2003 - 10:46 AM
Now that took long eough. Hard to diagnose a problem when you can only work on it in 20 minutes at a go, in the dark, after work.
The good news is I finally had a reason to buy a new Legacy.
warranties are a good thing.
thanks for everyone's help.
Posted 01 September 2003 - 11:08 AM
Same problem as described in the first post.
I have eliminated the fuel system from the equation because of the way the car acts. It's breaking up in the ignition somehow.
Hard to explain what it's doing. It's getting worse though. After the car warms up to op. temp. it acts like the ignition is cutting out for some cylinders. Bad miss, engine shakes violently when you attempt to give it throttle.
Will die quicker now than before. Will not idle after reaching op. temp.
A subaru mechanic guessed the ignition relay when I explained the problem. Same shop, talked to another tech and he guessed the same without hearing the first guys response.
How would it effect the car if this was bad? They both tried to explain where it is and what it looks like but I'm at a loss.
FSM picture or info anyone?
Today was a bit of a trail. I hate losing my temper at anything or anyone, especially an inanimate object, but this problem is really starting to get to me.
For Sale as is. 1200.00 is closer to what I really want to do with it.
Deep Breath. Diagnosing is the hard part. Fixing is easy.
BTW, I was just positive that it was the igniter. I even posted it as a fix for the same problem for someone else on the board. Jeez.
Posted 01 September 2003 - 11:18 AM
I had a EA-82 that acted sort of like this, the Cat was clogged and as it heated up it would block completely and not allow any acceleration.
Ripped apart the cat and it ran great.
Posted 01 September 2003 - 11:35 AM
Posted 01 November 2004 - 12:07 AM
if the coils were missing then the O2 code should set and the check engine light should come on. It seems likely if it has to cool right down that it is temperature related, electrical component or connector temperature that is. I would check the earths and power wires to the computer and engine as a first easy and free option.
Posted 01 November 2004 - 07:23 AM
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