Help!!!!!
I have a turbo ll. A little history; new motor a year ago, ran great, untill small engine fire ( think I pinched a wire under the upper intake, probably to the valve that opens with the power steering assist.) All the polution control is off, no air pump, cats, ACV, EGR. I have a Greddy boost control. Have replaced TPS, as the test light I have connected to the diagnostic plug said it was bad. Have replaced both primary and secondary injectors, replaced burned wiring, new plugs, new plug wires, replaced plug to ACV valve, new O2 sensor.

Car starts right up, idles fine. The problem is it stumbles on acceleration, not much power until the secondaries come on, then it screams. Also backfires on decelleration.

TPS is at 1 kohm, timing is dead on, car idles at 800 RPM.


Only thing I can think of is that part of the computer shorted out in the engine fire.

Any ideas?


Thanks,

 

Any ideas at all?

 

Check out the boost sensor(map sensor to some) per the online fsm. Or, at some trouble, tap into the output of the primary injectors with a meter , and see what happens when you stomp down on the pedal. The voltage should drop from about 11 volts at a steady speed prior to stomping on the pedal, to between 2 and three volts just prior to the secondaries coming on line. Or how about swaping the injectors, primaries to the secondary position etc? Is the timing really spot on? Which brings me back to the tps. Put a voltmeter lead up the back of the green wire with the red stripe on the tps connector with the engine HOT. At idle it should read one volt. If not get it b/t .95 and 1.10 at least. With the engine not running and the key on, open the throttle and the reading should be approx 4.5. So anyway, you got an answer to bump you to the top. By the way, is there anyway you can disconnect the Greedy boost controller? Then give it a try? But you have it figured out anyway. Ran good prior to the fire, ran bad after. Burnt wire. Burnt ECU maybe. How about going to the section 4B, under control unit, and measuring the output to the ECU from the various components? Might show a lack of a signal from a sensor, open wire etc.

 

Thanx, Hailers,

I'll try your suggestions. It's simple to disconnect the Greddy, I'll try that, too. I forgot to mention that I replaced my stock secondaries with 750's. Do I need a fuel management deice, or will these work OK with the stock ECU?

 

Thanx Jef.

 

Cool shirts!

 

Hey HAILERS,

Ever windsurf Bird Island, South Padre?

 

Windsurf Bird island? A lot. Gotta boat barn rented in Corpus Christi to store my gear so I don't have to carry much on the trip. Go ten to fifteen times a year. About five and a half to six hour drive. May be flat water but you can usually count on the wind being up some part of the day. Kite sailing is getting to be a big thing there. Go to the is site and click on the flag for Bird Island to see how the wind is blowing http://tcoon.cbi.tamucc.edu/ Good trip for a RX. So what is Pacey's reason for asking? You live a bit far for that, don't you? Frankly I can't at the moment remember your state right now, but it seemed a bit far for the weekend. Oh! The post on grounds sounds good. I dismissed it earlier because you said that the secondaries came on strong, but it could be the grounds since they (ECU) grounds are on the engine under the dynamic chamber. About three wires ganged together on a round ground lug, a bit towards the left of center and a bit to the rear, I think. Have fun. That free fsm is at http://www.iluvmyrx7.com/Technical_I...ice_manual.htm its a 88 manual but a 87 is close enough. Irv has made me aware that they changed just a few wire colors in 88 but they are few I think. Like the ground wire on a boost sensor on a 87 is brown and a black stripe where on a 88 it is just black. P.S. I just looked and its cranking from 27 to 33mph right now at Bird.

 

Hey HAILERS,


Hey dude, made a trip to Corpus about 8 years ago and camped out on Bird island for about a week to see how the REAL windsurfers do it. You guys are insane. I live in Missouri, lots a water, gusty wind. Keep gettin my board stuck in cow patties!(ha,ha)

In fact, I just got a pamphlet from Mistral on windsurf vacations. Maybe I'll make it to Aruba.


Hang tough, Dude!!!

 

Flat, shallow water, steady offshore wind, great place for a rube like me to get some air time. Best vacation I ever had!

 

Hey HAILERS,

Just read the thread on boost sensors and the pill that goes inline. I replaced that line with silicone hose. I also have a boost cut defensor. Do I need the pill?


Thanx Man,

 

I'd say yes. In one of those threads I think there is a part number or at least a mention that it cost about three bucks. Also look in those threads for a post by Keith (who is really Irv, most of the time) and you'll see that he had a problem without the pill. I had a problem when I replaced my vac hoses on a na and it was corrected when I put the old hose with the pill back on. I also saw a post by Gibson that said the na did not need a pill. I respectfully disagree. My turbo has a pill or orifice. YOu should put one in. If you still have the old line, split it open and see if there is one there. That might be part of your problem, maybe.

 

I agree- I had the EXACT same problem with my N/A . I would say check the pressure sensor- try resetting the ecu (cut power for a few minutes) then run with the pressure sensor hose disconnected (gulp) for at least 5-10 minutes to let the computer re-adjust to things. ABSOLUTELY DO NOT FLOOR IT OVER 4000 RPMS WITH THE SENSOR DISCONNECTED!!!! You will lean out like crazy and blow your motor. Then you'll have to sell you kidneys on the black market to fix up your TII, but it's all downhill from there....addictions to pain killers....hookers....Mustangs.....
Anyways, if the jerkiness is gone, then think about replacing the sensor, or put a pill (restrictor) in the hose (most likely fix).
Should do it.
Good luck

 

I have only one real problem with the pill being your problem. If the car ran good before the fire, and you had replaced the vac hoses before the fire, then you would'nt think that was your problem since the car started running bad after the fire. Right? Still, I would make sure there is one there no matter what. I just rechecked my sensor and its still around 1.98 with just the key on and pulling 3.9 in/hg. Oh yes. About Aruba, do it. Been there twice. Last time was two years ago. Stayed at the Boardwalk. First time was at least ten years ago. The place has grown enormusly(sp). Rent a car and drive around the island. Talk about contrast. The fishermans hut area looks a little like Hawaii(thats just a small stretch) the rest of the island looks like a piece of far west Texas at its harshest, cactus etc(that description is not a stretch at all). The water is unreal in clarity. The water off Fishermans Huts area is flat and offshore. Wind cranks pretty good. Check the Vela site and they have data on the wind speed. I used VELA windsurf vacations outfit. Forgot the complete name. A number of casinos there also.

 

Hey BamBam,

Thanx, don't think anyone would want my kidneys, they got trashed with my liver.

Hey HAILERS,

I did replace those lines before the fire, car ran OK, maybe not as good as it could have. Tell me about the geen turbo control solenoid on the '87 Tll. I disconnected it, as I couldn't control overboost, even with the Greddy. Disconnecting it seemed to help.
Thanx for the info on Aruba, got to go there one of these days. BTW, what windsurf gear do you use?


Thanx guys,

 

That switching solenoid controls the switching actuator(who woulda thought) and the actuator either reduces the amount of gasses to the turbine wheel or increases the amount by a large flapper that reduces the exaust passage size by covering it up or increasing the size by withdrawing out of the way. I admit being a Newbie to turbos. Got my first turbo in May. Salvage vehicle. Sounds like you need to increase the size of the wastegate(port it). Try http://k2rd.freeservers.com/FC3S/PRO.../solenoids.htm somewhere in that k2rd.freeservers.com you will find info on wastegate porting. You must have a wide open exaust. Right? Seems that the switching actuator not functioning would cause slow spool up, but I see why you have it like that. Won't the porting or increasing of the wastegate put you in a position where you can reconnect the switching actuator solenoid(green)?My turbo, 87turboii, is basically stock with http://www.mazdatrix.com/r-extii.htm Mazdatrix part 16207. If I get the cat back I'm getting into trouble. The boost is going to get too high and I'll have to take preventive measures(spend big bucks on big ticket items). Sail a Bruce Jones 8ft 11", Nei Pryde 6.1meter large sail and a 5.5 NP V8. for regular sailing and a 4.5 for when it really cranks. Broke toe on left foot(poor baby) in the spring then the wife's got big health problems so this year been a big loss in the windsurf area. Maybe next spring if I don't waste away getting fat.You have this? http://www.iluvmyrx7.com/Technical_I...ice_manual.htm

 

Hey Hailers,

Sorry about the toe, I've done it and it hurts like a MF! I neglected a few things in my descriptin of the car. I do have a Racing Beat turbo back exhaust with an up-graded rebuilt turbo. Even with the Greddy boost contol, I would spike over 15psi if I wasn't careful to lift my right foot. You may be a novice with turbos, but you sound like you've forgotten more about modern engines than I'll ever know. My first car was a '41 Ford pickup that I dropped a 327 with a Muncie 4-speed in, tied to a 12 bolt 4:11 rearend. Quick between the lights, not worth a **** on the freeway. Modern engines and drivetrains are beyond me.

I learned to surf on a Mistral longboard, more stable in the conditions here in the armpit of the nation. Tried a short BIC board my friend had when in Padre, it was cool. Funny story; There was a place in Corpus that custom made Mylar sails, forget the name of the place. My buddy, a beginner, maxed out his credit card for one of these awesome sails. His first time out, a gust of wind caught him and he fell through his new sail. Never seen a grown man cry like that.