1G 1G 4G37 cranks but wont fire.

[fst100]

Car is a '90 Eclipse GS with the 1.8L motor. Currently has over 200K miles. I've searched like a mad man but also need some input, my car just started stalling while driving and now it cranks but won't have combustion. The car was just bought the other day and the car has had the following parts replaced by the previous owner:
Alternator
Fuel filter
Belts
I had a tune up done
Fuel injectors
TPS sensor
I had a diagnostic and thats all that came up.
New tires and I had alignment done
I had the fuel pump checked twice and was told that it worked. Spark plugs were new also when they put the TPS and fuel injectors.

I went ahead and changed the plugs and regapped to 0.044
-plug wires
-distributor cap and rotor.

My friends say when I turn the key to acc on before turning it to crank, they did NOT hear the fuel pump prime from behind and under the car. Now it leads me to believe it is a fueling issue, quite possibly the pump but the previous owner said it was checked twice. I'm still getting aquainted with the engine bay area, is there any electrical fuel wires i can check to see if they're fouled, bad, torn, etc?

I do have the haynes manual and am currently as you read this looking through it. any tips and advice is greatly appreciated!!

 

[northendtrooper]

Check your fuses. I'm sure something crapped out and it blew a fuse.

 

[fst100]

checked the fuses in the engine bay as well as under the drivers column and no fuses shown blown

 

[fst100]

yea one of my friends sprayed starting fluid into the intake while i started the car. it fired up for 1-2 seconds then stalled again.

 

[spectre22]

I would go ahead and check all of the basics out even though it seems to be a fuel problem it still might not be. Checking to make sure it has spark is really easy to do. And i know the distributor on the 1.8 do tend to have problems.

 

[steve]

The fuel pump should prime when you start cranking not before.
Put a volt meter on the harness to the pump and see that it gets power during cranking.
If it doesn't look at the MPI relay and make sure it's working correctly.

You'll need the MPI wiring diagram for the 1.8L car.

That fact that it runs off starting fluid is a good sign. They tend to have problems with the distributor and it's embedded CAS, PTM, and coil.

 

[fst100]

The fuel pump should prime when you start cranking not before.
Put a volt meter on the harness to the pump and see that it gets power during cranking.
If it doesn't look at the MPI relay and make sure it's working correctly.

You'll need the MPI wiring diagram for the 1.8L car.

That fact that it runs off starting fluid is a good sign. They tend to have problems with the distributor and it's embedded CAS, PTM, and coil.

Wow I did not know the fuel pump won't prime when only the key is turn to accessory I guess I should try it again with someone listen carefully around the gas cap and hear it there when I crank the motor over.

I'll also look into the MPI relay you spoke of. It's late right now but I'll start on the diagnose tomorrow morning. Please wish me luck i have had a bad day with this car already

 

[fst100]

also i should note that when i try to crank the motor over to fire and when it doesnt i hear i belive, 2 clicks. im guessing the MPI relays are doing it? if so then the MPI relays are working but it may be something else? i also read that a bad ecu could be the culprit because of the caps leaking? where is the ECU located by chance so i can check the circuit board for any burn marks on it around the capacitors?

corretion, not 2 clicks but 4, where the first 2 clicks are closer together then the other 2 clicks together.

 

[fst100]

Ok I think I found my problem. I took the ECU that's located in and under the center console under the radio and opened it up. Looks like a section just to the last of the blue diodes down by where the wire harnesses plugs into seems to to burned as well as that dead fishy smell. Am I correct to say the ECU is fried and needs replacement? If so is this guy still around for me to ship to repair? What kind of costs am I looking at?

Automotive Computer Supplies
2280 East Main
Suite B7
League City, TX. 77573
888-326-8646
www.ecmtogo.com

edit-I forgot to add in about the problems I noticed. The CEL light intermittently turned on and while it was on the car felt like it'll studder and misfire then when it goes away it runs 100% fine.

Wish I had a digi-cam to show you but I narrowed the possible 'culprit' and it seems to be one of the large capacitors on the ECU. If anyone has a pic of the 1.8 1g DSMs please post it ^_^ anywho this was what was printed on the capacitor:
G24
-55-+105*C
837

 

[steve]

You'll notice that all the parts have numbers marked on the board. All the capacitors start with C, all the resistors with an R, all the diodes with a D, etc. I don't have any pictures of 90 1.8L ECUs to reference.

It wouldn't surprise me that the capacitor had leaked and the leakage has corroded the circuit traces. That's what happens to all of Mitsubishi ECUs from the mid 80's until the 2G. You'll need another MD128658 or find someone that works on the 1.8L ECUs (I don't) and can repair yours.

On the turbo cars the 90 models have issues swapping a later ECU with the tach. I don't know if that carrys over to the base car. I don't know if they even have a tach. The 1.8L ECU pinout is different from the 4G63 cars so the other issue with swapping pins 6 and 14 likely doesn't apply when putting a 91+ ECU in it.

 

[fst100]

ic thanks and i'll look at it again. anyone else? ^_^;
thanks for everyone's help!! i wouldnt know where to start w/o reading throgh the forum

i've done a few searches for ecu swaps but came up empty handed as most of the old posts are ecu swaps for the 2.0 n/t and turbo vehicles. any input is greatly appreciated!!

i found an ad that someone is selling an ecu for the 90-92 1.8 but i am waiting on whether its auto or manual as mines manual.

if the seller's ecu is auto, will it still work or not?
here's his part number off the ecu:
MD159561 E2T33674 2204

i found out the ecu the seller has his ecu numbers ending in 9561 and he says it is for autos, but he also said his old ecu that was in his car was also ending in 9561 but his car is manual. anyone?

 

[fst100]

I have a 1990 eclipse 1.8 5-speed. I did a few searches but came up empty-handed. The vfaq site I looked over and didn’t find anything associated for the 1.8Ls. basically one of the caps off my ecu gave out and leaked, causing the car not to fire up, but only crank and crank and crank. I found a seller who has a spare ecu that’s a 1990 and his car is a 5-speed however his says the ecu he has on his ecu box has this:
MD159561 E2T33674 2204
Whereas he says the ‘9561’ is designated for autos. However he also said his old ecu that fried also had that same numbers but again, his car’s manual. Can I just simply plug that ecu into my car without rewiring pins #14 and 6?

 

[steve]

The 5 speed and automatic ECUs are the same part number for 1.8L DSMs. There are Federal and California versions and 90 or 91+ models for a total of four different ones. I keep a list of what's used where at Eclipse Talon Laser Galant 3000GT Stealth ECU ID Reference

 

[fst100]

nice, thanks for the link/list and info steve

 

[spectre22]

I feel it is better to get the right ecm for your car than changing pins to make one work. Here is a great site for ecms www.motoguysgarage.com the sell DSM ecu's they give a week test drive on them and a one year warrenty.