Another Problem

[mko]

Here's another one:


I dont know when it started exactly, but it was around the time of the deer accident.

At 0:14 and right after that you can see and hear the bog - my AFRS go rich. It does it when I drive as well and of course shakes the whole car. IDK if spark gets fouled or what could possibly cause it. Ave changed pretty much anything and everything, Whats left to change is fuel filter and put back the ISC /blocked off/

[4-G-rim]

Does "bogging" happen during acceleration, cruise, or deceleration?

[mko]

It happens at idle and light throttle accelerating or cruising. If i step on it it goes fine.

[mikey_turbo97]

My car is doing the same thing at accel and cruising but i still have the sputtering issue at accel and when i hit hi boost. Have you noticed any sputtering. I will tell you this. I had one of those manual boost controllers with the bleeder and that thing was creating a crazy boost leak. ( I have to say i did cheap out on the boost controller..... big mistake) the sputter is less making me think i still have a boost leak somewhere else.

Just saying

[mko]

No I have no spark issues/sputtering/ its very silent and muffled. Yeah i have a boost controller with the bleed valve, I believe 4GRim has the same one as well. I got it for 35 and it was highly recommended by the Vr4 community. I think i might just run the line from J-pipe to wastegate and bypass the MBC.

[4-G-rim]

I doubt that its the MBC causing your issue....but you can try and see if it resolves your issue.

Have you checked for "boost" leaks in your cold side piping? Maybe there is some unmetered air readings that is causing you to run rich for just that short bit of time. I am still trying to see if there is a solution that I can think of.

[mko]

IDK what is wrong with this car. Now I cant boost much. It goes to 2 psi max. I even bypassed the MBC and ran the line from the j-pipe to wastegate and still the same.In third I see some like 4-5 psi, but thats it. My girlfriend filled me up with 87 while I was paying inside the gas station, I hope this is why i cant boost. Another thing, when I open the oil cap while car is running, there's lots of air coming out. I now it's a blowby, and my compression is 200 across, so it may be a leak from the turbo seal thru the oil drain and in the crank case. i'm about to put my stock injectors back and start all over. it's either bad turbo, bad MAS or clogged cat, IDK .

I still have the hiccup and it gets no better. Ive tried everything possible. My AFRs are normal, but my spark plugs are white. It acts like a post MAS leak, but Ive checked it all.

Im about to put my stock MAS and just run the SAFC.

Im open to any suggestions

[1992Galant]

got me brother

[4-G-rim]

Well did you did a boost leak test?

When I was working for my friends shop there was a guy with a SRT4 with similar issues with not building boost. His BOV didn't close all teh way..so it was leaking.

If you had a leak on either your oil or water in the turbo..you will see it come out of the exhaust.
87 octane will cause your car to run crappy especially after you turbo it...but not to the extent of have white plugs.

A clogged cat converter could be another cause...do you have a high flow cat?

[mko]

yes, its a high flow cat.

I fixed the no boost problem. I had a small leak in the j-pipe gasket and now since i removed the MBC, it pushes 8-9 psi and I like it. Filled it up with 93 and she runs again.

On a side note. I stll have the random bogging issue.
So far, i Havent messed with fuel system only. Upgrades i have done to it:

Aeromotive FPR, Evo9 pump /not rewired/, braided lines,summit racing high flow fuel filter, earl's 6an fittings, fuel rail fittings.

I replaced the main ground wire today, and still does it.

i was told it could be clogged cat. I have 3'' high flow magnaflow cat and 3'' cat back. still have the silencer.

It really weird. i dont hear any popping or misfire. its very quiet and muffled like its a post MAS leak. It usually does it at 10% throttle and when i keep my foot steady. If I accelerate its fine. Its random, not it pattern. It happens more often after its been in boost. Idle is at 22hg/inch. I removed the charge pipe before the GM MAS and still does it. I was having problem with one of the TB nipples, it was clogged, but I fixed it. The only other thing i can think of is bad TB.

Could it be some kind of pre-ignition?

[mko]

So, I did a few things today. I was trying to eliminate things one by one on top of what Ive done so far.

Switched back to my OEM fuel filter /brand new/ and filter to rail line, installed different TB and just in case I switched to 510cc. Well, the thrill of 510cc acceleration felt nice, but my hiccup problem still persist, and its driving me crazy.

Things Im doubting that might be the problem:

Aeromotive FPR, distributor and HG.

[4-G-rim]

Its possible also that your TB throttle plate shafts seals are bad and leaking through there. Is your TB original or rebuilt?

[mko]

rebuilt it 3 months ago. the TB i put in today was old and the thing was leaking like crazy, but the one I had is holding up good.

[4-G-rim]

Well to be honest you "hiccup" issue is something I have with -G-rim even way before I turboed it. It only happens though if I stay at a low MPH especially in lower gears for a long period of time but never when you experience it. I haven't been able to fix it since I bought the car.

[mko]

Is it the same as on my video?

Its not a misfire, its not like the plugs get fouled and then spark again, that would make the exhaust pop. Its silent and muffled.

[mko]

so, I put new coolant temp sensor and switched back to my stock fpr, and guess what, its still doing the hiccup. So most likely i have an ignition problem. The distributor is probably going.

[skrap]

I rode in the car today and I have never really felt something like that it almost feel like an auto tranny slamming into gear.. But hes manual and it only does it when he is in low rpms cruising , not shifting.. I think it might be the distributor..

[4-G-rim]

Is it the same as on my video?

Its not a misfire, its not like the plugs get fouled and then spark again, that would make the exhaust pop. Its silent and muffled.

Well...sort of in a way. Mine only happens in low gear, constant rpm, at low mph (under 15mph). Never does it any other time. Its been like that from the day I 1st bought the car way before it was turbo. I tried to diagnose the problem but no solution yet..I have suspected the distributor, but never got around to try another one. I may try another distributor, but the problem hasn't been a issue for soo long or has not got any worse.

[1992Galant]

distributor ,spark plugs and spark plug wires

[mko]

Changed the ECU today.....same shit, no difference. Skrap went to switch his "brand new" distributor that didnt work with another one, so we tried it on my car and we found out the "new" one we got has misaligned rotor

[1992Galant]

engine timimg . what about that

[94DSMTURBOGALANT]

My 94 s had a hicup just like yours and at low idle and only at certain times. Replaced the distrib. with one out of a 94-95 obd 1.5 g and solved it totaly. put my old distrib in a 95 es and did the same thing mine used to. Try the distrib buddy.

[4-G-rim]

Hey Mko....I saw that you posted your issue on the Gvr4 boards, and another member there suggested the distributor. I know you said you tried it..but for the hell of it, try another one just in case.

I myself is planning switching my distributor and seeing if that solves my similar issue.

[mko]

I still havent switched dizzies yet. Why...well because the brand new dizzy Skrap got for his car didnt work twice. The shaft an rotor were incorrectly manufactured and put together which made the ignition timing well too advanced. Car would barely run with distributor set to the most retarded point/ thats for 94-95, 96-98 do not have that adjustment/

[skrap]

Actuall,y it was put together to retard the timing wayyyy too much!! We are going today to get another one and this time we are bringing an old distributer to make sure it works!!!

[94DSMTURBOGALANT]

Obd2 distribs wont work. Just a fyi. Tryed the one from my 97 and wouldnt even start. I think its cause the obd2 g's have the crank position sensor and the obd 2's dont have that function in the distrib. like the obd 1.5's. Good luck, Hopefully the distrib works.

[Proto]

Why not just go to a junkyard, take the internals and keep your housing?

[skrap]

Because I have a brand new one that has A warrenty. If he goes to the JY it could have the same problem with the distributer... He is going to test it out with mine and then buy a new one on ebay for like 90 bucks..

[mko]

SO SO SO, I got it fixed. OMG what a relief.

well the MAFT needs a RPM signal so u can tune with the knobs for low, mid and wot, but I dont use it since I have the SAFC do the fine tuning

Anyway, I had the wire tapped in the distributor for RPM signal, and soldered there. i was playing with it today and wiggled the 2-pin plug and it kind of did the hiccup, so I was like hmm and pulled that wire off and tada. so the MAFT was stealin the signal form the ECU to the distributor - making it weak enough to trip the power transistor shut meaning that the level of the incoming signal was so low that the power transistor wasnt able to open at times....doing the hiccup. Thats why it was quiet, and not like a misfire sound /pop/

[4-G-rim]

Its safe to say that I even could of not diagnosed that as probably many others....but it was suggested several times its probably something with the distributor, in your case..it was wiring. Glad you fixed the issue man.