Need advice: 4g93 SOHC auto 'semput'

[sanekit]

Hi! I recently converted my '00 wira 1.5 VDO to 4g93. The half cut engine doesn't seem to have any leaks whatsoever. Only the mesin jahit sound. I took my car from the workshop 3 days ago.

At first, everything was running smooth. Just a bit sluggish during acceleration (had to step more on the pedal to get the car going. I send the car back coz the had some minor loose stuff on the interior, aircond valve problem and wiring. Then the workshop messed up by not installing the bracket for my battery. The battery got toasted because of the positive terminal short circuit on my front hood. They replaced the battery, installed the battery bracket back.

And yesterday, the car started to semput2 when on aircond and timing is very low. When off aircond, the car timing went up to 1700-1900 rpm. Sent back and they said need to check the computer system and see if there's enough fuel supply etc.

What I meant by semput is when i accelerate after stop, 1st gear is ok, 2nd gear the rpm drop and the car feels very heavy. I had to floor it down to get it moving. Only after 1-2 seconds the car will get it pace back.

I didn't change my exhaust, tank and fuel pump. Extractor is 4g93, piping stock until the muffler (single tip sflow). stock fuel tank with denso fuel pump changed april last year. no need to pump the gas to start the engine.

Any advice on this? I'm thinking of sending it to another workshop to check and then claim from the workshop that did the installation. Feels very frustrated coz I had spent almost RM8k on the engine with dashboard, steering and wiring.

 

[^pomen_GTR^]

most likely wiring issue such as ecu or coil pack or injector resistor pack related...

comfirm due to battery shorted

 

[sanekit]

most likely wiring issue such as ecu or coil pack or injector resistor pack related...

comfirm due to battery shorted

Aduh! Meaning i have to do computer check to find the problem?

 

[^pomen_GTR^]

Aduh! Meaning i have to do computer check to find the problem?

should thats where to start locating the electronic fault...

 

[sanekit]

should thats where to start locating the electronic fault...

ok. i will try and do a computer check. meanwhile, i went to a friend's workshop just now and ask him to check. he said the head gasket leaking (saw some oil near the gearbox), auto gearbox not that smooth (when do sudden stop, gear doesn't shift to 1, gear starts at 2. hence the lag). he also ask me to go and check the throttle body because of the timing problem idle at 1700-1800 rpm when aircond is off and when aircond is on timing goes back to 900 rpm, when shift to D the timing goes down to 300 rpm when aircond is on.

I called the workshop that did the installation, they said they will install FICD to fix to the timing problem. is it necessary to install FICD on this engine? should I just change the stepper motor and service the throttle body instead?

this is my first time changing engine and I'm not that knowledgable when it comes to technical stuff. :(

 

[Shinjite]

Bro, avoid the FICD.....just get a brand new replacement stepper motor/ISC. Even if you get a FICD, once the stepper motor/ISC KO, you will get idle hunting, idle soaring issues and etc etc. The FICD only helps you when your aircond compressor kicks in.

For the stepper motor/ISC, call this guy Franky (012-3223583)

 

[sanekit]

Bro, avoid the FICD.....just get a brand new replacement stepper motor/ISC. Even if you get a FICD, once the stepper motor/ISC KO, you will get idle hunting, idle soaring issues and etc etc. The FICD only helps you when your aircond compressor kicks in.

For the stepper motor/ISC, call this guy Franky (012-3223583)

I saw his post on LYN forum. Thanks for clarifying on the FICD. I read a few forums that 4g93 doesn't need FICD. More cash flowing out like this. lol.

 

[Shinjite]

Yes, you know why? Because I just replaced my stepper motor as well. Bought from him. Previously I suffered from idle hunting and soaring issues and the FICD only helps when the compressor kicks in but to be honest, if FICD is really needed, why Mitsubishi didn't implement it?
Now withe the new stepper motor and idle tuning, it runs nicely with or without air-cond. Plus I have totally disabled my FICD, turn it off and cut off the wire to power it.

 

[sanekit]

Yes, you know why? Because I just replaced my stepper motor as well. Bought from him. Previously I suffered from idle hunting and soaring issues and the FICD only helps when the compressor kicks in but to be honest, if FICD is really needed, why Mitsubishi didn't implement it?
Now withe the new stepper motor and idle tuning, it runs nicely with or without air-cond. Plus I have totally disabled my FICD, turn it off and cut off the wire to power it.

I'll give him a call later and ask for the price. Thanks man!

 

[Shinjite]

I'll give him a call later and ask for the price. Thanks man!

No problems. Glad to help. The price may be steep but I say it is worth the investment. No regrets. :)

 

[Izso]

Apart from wiring, since this is a halfcut I'm thinking you might need a new fuel filter too

 

[sanekit]

Apart from wiring, since this is a halfcut I'm thinking you might need a new fuel filter too

pardon my noob question, the one at the tank or in front? I seriously don't know where the fuel filter is.

 

[vr2turbo]

Yours should be in engine compartment

 

[sanekit]

Yours should be in engine compartment

I'll check it tomorrow. Gonna send the car to Frankie to change the ISC. Finger's crossed if that's gonna help with the 'semput'-ness.

 

[^pomen_GTR^]

Yes, you know why? Because I just replaced my stepper motor as well. Bought from him. Previously I suffered from idle hunting and soaring issues and the FICD only helps when the compressor kicks in but to be honest, if FICD is really needed, why Mitsubishi didn't implement it?
Now withe the new stepper motor and idle tuning, it runs nicely with or without air-cond. Plus I have totally disabled my FICD, turn it off and cut off the wire to power it.

with the use of ficd, u need to disable the original ISC....

im using 2 ficd...1 for cold start and another one for ac.....because my car isc went crazy idiotic setting....now worn gear..no check engine light, tps voltage setting was correct....but acting weird when morning cold start works fine...then alter 20mins trip or 30mins trip..stopping at traffic light, the idle speed will increase to above 1200rpm.... sometimes ok..sometimes not....so i locked the isc to predetermined setting, remove the gear linking isc to the stepper motor...then put 2 ficd..problem solved...now i got manual cold start choke and ac idle speed control..which both i can manually fine tune with just screwdriver (*i'm a manual man)

 

[Shinjite]

with the use of ficd, u need to disable the original ISC....

im using 2 ficd...1 for cold start and another one for ac.....because my car isc went crazy idiotic setting....now worn gear..no check engine light, tps voltage setting was correct....but acting weird when morning cold start works fine...then alter 20mins trip or 30mins trip..stopping at traffic light, the idle speed will increase to above 1200rpm.... sometimes ok..sometimes not....so i locked the isc to predetermined setting, remove the gear linking isc to the stepper motor...then put 2 ficd..problem solved...now i got manual cold start choke and ac idle speed control..which both i can manually fine tune with just screwdriver (*i'm a manual man)

You FICD king

 

[sanekit]

with the use of ficd, u need to disable the original ISC....

im using 2 ficd...1 for cold start and another one for ac.....because my car isc went crazy idiotic setting....now worn gear..no check engine light, tps voltage setting was correct....but acting weird when morning cold start works fine...then alter 20mins trip or 30mins trip..stopping at traffic light, the idle speed will increase to above 1200rpm.... sometimes ok..sometimes not....so i locked the isc to predetermined setting, remove the gear linking isc to the stepper motor...then put 2 ficd..problem solved...now i got manual cold start choke and ac idle speed control..which both i can manually fine tune with just screwdriver (*i'm a manual man)

Whoa! Serious manual king. Hehe.

I'm changing my isc now. Hopefully no more semput.

 

[sanekit]

UPDATE: After changing the ISC and fuel filter, no more serious idling problem except while aircond compressor is on, timing went up a bit. No more serious 'semput'-ness but engine still idle a bit low (600-700rpm) when gear is in D and aircond is on. Gearbox gradually feeling a bit better but I still feel I need to send it for check up.

Gonna send it for top overhaul next month. Any tips on that? :)

 

[vr2turbo]

Why didn't you do the top overhaul before transplant? But then is your engine in need of top overhaul?

 

[sanekit]

Why didn't you do the top overhaul before transplant? But then is your engine in need of top overhaul?

Budget restriction. But at first, everything sounds ok. My friend saw leaking nearby the gearbox area. He said maybe the head gasket leak. So i guess i do need a top overhaul. I don't know whether i need to send the gearbox for checkup or not. Don't have the budget for that. Acceleration sometimes feels a little bit lag. Gear shift also a bit hard. My mechanic friend only free after CNY.

Anyways, 4g93 sohc does not have hydraulic lifters right? Need to do tepet adjustment. ;(