Wont stay runnin after bse

[PROJECT_90_GSX]

Hey I’m Mike I haven’t posted much here but I’ve been here a while, Anywise I have a question for ya. I recently replaced the motor from my 90 gsx with one from a 91 and did a BSE, and vacuum elimination on it. Installed a MBC and gauge. Well iv been working on this for about two years and finally started it yesterday. It acts like its not getting enough fire or it’s only hitting one cylinder it idles really rough and backfires, when you give it gas it dies. I pulled the plugs and they were soaked in gas. Checked them and they seem to be getting fire. Can anyone give me a few options as of what to look for and what to check???? I also used the knock censor, coil and power transfer from the 90. Was this wrong to do??

Any help would be greatly appreciated

 

[90moneypit]

Welcome to the wonderful world of 1990 eclipses, you will become familiar with every part that only works on a 90 and no other year... For you, the lesson begins with the CAS. That's the round thing that sits on the camshaft on the opposite side of the timing gears. This is a 90 only part that you'll need to pull off your old engine (you don't want to know what they cost new from dealer), put a new o-ring on it, and install on your 'new' engine. So long as you used the 90 coil AND ignitor AND tach driver, everything should be fine. Basically, if you pulled the intake manifold and head off, intact, and put it on your 91 engine you'd be fine. Well, maybe not the entire head but all the sensors. You'll also need your 90 throttle body as well (sensors again). It sounds like you took care of the rest of it though. Let me know if that works and we'll go from there.

 

[PROJECT_90_GSX]

Thanks Moneypit, Is it necessary to remove the timing belt to swap the CAS?

 

[90moneypit]

Nope, it's on the opposite side (passenger side by TB) and has 2 nuts and a plug, that's it.

 

[PROJECT_90_GSX]

Ok, the manual said to remove the timing belt, the thought of doing that with the motor in the car sucks.

Wont even fire now.....

 

[PROJECT_90_GSX]

Any other ideas?

 

[hisandherturbo]

check base timing.............. the cas is also used to adjust base timing, so taking it off/back on........... get a light, put it at 5*, start over.

 

[dsm8883]

Ok, the manual said to remove the timing belt, the thought of doing that with the motor in the car sucks.

Wont even fire now.....

For what? Can you give more info??? what have you done and checked as of now?

 

[Alex Bland]

As he told you to change the CAS remember that it can be put in 180* wrong.. look into that

 

[jrohner]

Mixed up plug wires?

 

[PROJECT_90_GSX]

cas is correct, Firing order is correct, Maby the gas is bad after 2 yrs of sitting? gonna check that and the timing today and get back with ya.

 

[PROJECT_90_GSX]

sorry to keep buggin, I got it ti iddle. boost showing vac at iddle and will only accell to 2500 rpm, smokes and shows no boost on the gauge, any thoughts on this prob?? boost cont. makes no dif on the boost gauge.

also has verry little throttle response, all vac lines are pluged on the throttle bod on 90 tb. could this be a prob? Also looks like gas or water coming from exaust manifold.

 

[9!'clipseDOHC]

Now that you've got it running and idling, you need to do a boost leak test.

I'm assuming you are using a 14b, right? How was the shaft? Was there a lot of play?

Did you change the gas? Also if its been sitting that long you might also need a new fuel filter.

As far as water in your manifold, thats not good. Did you properly torque down the head? What kind of head gasket are you using?

 

[PROJECT_90_GSX]

Its all stock and the turbo shaft had no play, I never removed the head, but i havnt checkes the tork on it either,yet. I did change the gas, It was aweful, and filter. I put a hbc and it and a boost guage, did a bse on it, and vacume line elimination.

the motor is from a 91 eclipse gs fwd and put it in a 90 gsx , 4g63t

 

[9!'clipseDOHC]

Its all stock and the turbo shaft had no play, I never removed the head, but i havnt checkes the tork on it either,yet. I did change the gas, It was aweful, and filter. I put a hbc and it and a boost guage, did a bse on it, and vacume line elimination.

the motor is from a 91 eclipse gs fwd and put it in a 90 gsx , 4g63t

GST. Was the donor car running? The reason I ask is because it could have had a blown head gasket. I'm assuming you got the engine from a junkyard?

Definitely do a boost leak test though.

 

[PROJECT_90_GSX]

Yep, from a junk yard type place....Would a head gasket make it not rev above 22-2500rpm? I have a head gasket, not sure what it is, it came with a gasket set i got a while back from PD.

 

[9!'clipseDOHC]

Yep, from a junk yard type place....Would a head gasket make it not rev above 22-2500rpm? I have a head gasket, not sure what it is, it came with a gasket set i got a while back from PD.

The reason I was asking about the head gasket is because you said there was water in the exhaust manifold. Water comes form coolant, the head gasket keeps the water in the block and head's coolant passages, therefore out of the manifold.

You pulled the engine out of a car at the junkyard and never took the head off or checked the head gasket? You know there was a reason the car was in the junkyard in the first place, usually a blown engine (most common I would say are snapped timing belts or blown head gaskets).

As far as not being able to rev past 2500, that sounds like a boost leak but it could be anything. Is it making any weird sounds when you rev it up?

What all did you do to the motor before you dropped it in your car besides eliminate the balance shafts?

 

[PROJECT_90_GSX]

Actually i got the entire car, The man that got rid of it said the computer was bad for the second time and it wasn't worth fixn for his wife who drove the car,, He dropped it off at a scrap yard that smashes cars. I seen it on my way to work and stopped in, The guy that owns the place traded me for another car for wght. But that's about all i did the motor was the BSE.Changed all the components with the ones off the orig. motor. Like the tb, coil, dist, cas, New Timing belt, tensioner, Water pump, oil return pipe, boost controller. I didn't pull the head. But i will this week end probably. Upon inspection of the motor i didn't seen signs of trouble. Still had coolant in it. Oil looked good also. The fiav or whatever that is on the bottom of the tb makes a clicking noise, Under rev you can here the turbo spool and a zzzzzzzzzzz, when you turn off care the air cleaner hauls for a second.

It actually smells like gas

 

[9!'clipseDOHC]

Ok I see. The spool and motor sucking air in when you shut it off are good signs. So you are using the which ECU are you using? I'm assuming that you are using the '90 since the '91 was supposedly bad, right?

If you are fairly certain that it is coolant in the manifold then I would pull the head and change the headgasket. There are other explinations though. Check out these threads: Water leaking from exhaust manifold, Lots of Coolant coming out my exhaust, Coolant leak from exhaust manifold/head area.

Check out the easy things before pulling your head. You don't want to have to reset the timing belt if you don't have too.

Also once you get it idling do a boost leak test!!!!! There are instructions here and you can make your own tester super cheap with couplings from Home Depot.

 

[PROJECT_90_GSX]

iddln good now but wont rev past 3000 or so, and the mbc seems to do nothing! unplugged, turned up a bit, turned all the way up, nothing different. it smokes black under throttle and just wont get over that hump. could this be exaust issue? damnit i just cant figure this out been without my gsx for three, 3 years now!!!!!

 

[ShawnsGarage]

Did you do a boost leak test? This will most likely point to your problem.