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Topic: Shuddering engine...UPDATE July,1 (Read 14893 times) previous topic - next topic

Shuddering engine...UPDATE July,1

Reply #105 –
If you pass the ballance test, I would assume it to be an o2 issue. Pull them out and try cleaing them, and if that doesn't work, replace the sensor.

You can temporary bypass the o2's by un plugging them. This will cause the computer to go into a type of fail safe mode, and it will run the car bassed on standard tables and turn off the adaptive fuel strategy that is used to account for the way different engines run and wear on the engine. If the miss goes away with o2's unpluged, its probably just a bad o2 reading.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Shuddering engine...UPDATE July,1

Reply #106 –
Ahh, your quick.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Shuddering engine...UPDATE July,1

Reply #107 –
I'll try that test as well.....after I figure out how. I'll check out the SBFtech info.  !!!!!!
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Shuddering engine...UPDATE July,1

Reply #108 –
Would bad O2 sensor (s) cause the car to have a backfire? The Sport has done it 4 random times, at lower rpms, like accelerating slowly from a stop.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Shuddering engine...UPDATE July,1

Reply #109 –
Alrighty....status update.....

The balance test, if I did it right, shows an 8, which is cylinder 8. Plugged injector? Not sure.

On the "wiggle test"...I got a code 95....fuel pump secondary fuel circuit fault....no idea what that means.

Before the balance test, it went through codes, and gave me 4 of them....

94
44
33
21

That's where we are right now with the Sport's health issues. Now, what do we do?
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Shuddering engine...UPDATE July,1

Reply #110 –
Quote from: softtouch;392775
The balance test takes awhile so you will have plenty of time, or you can operate the throttle under the hood. Or you can place your meter where you can see it through the windshield.
The test will turn off the engine when it is done.


After the cylinder balance test is done the engine will return to idle and the computer will display the code (9 is pass, any number 1-8 indicates a bad cylinder). The engine will not shut off. It will continue to run until it is turned off via the ignition, as normal.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Shuddering engine...UPDATE July,1

Reply #111 –
Yeah, I got that. I got an "8" on the test. SOMETHING going on at the number 8 cylinder. I'll check the injector (looking for a replacement now) check the plug again, and hopefully it's not a valve. I doubt a valve is the problem.

Ready for any ideas at all............
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Shuddering engine...UPDATE July,1

Reply #112 –
Quote from: vinnietbird;392904
Alrighty....status update.....

The balance test, if I did it right, shows an 8, which is cylinder 8. Plugged injector? Not sure.

On the "wiggle test"...I got a code 95....fuel pump secondary fuel circuit fault....no idea what that means.

Before the balance test, it went through codes, and gave me 4 of them....

94
44
33
21

That's where we are right now with the Sport's health issues. Now, what do we do?

On the KOEO test the code 95 is the wire you didn't run for the fuel pump monitor when you did the MAF swap (I know because I didn't either and that's the code mine throws during a KOEO test).

If it showed a code of 8 then yes you need to check cylinder 8 to see if the injector, plug, or plug wire is bad.

94 and 44 relate to the Thermactor system. If you don't have it ignore the code (my Thermactor system is gone and those are the only two codes my car throws during a KOER test).

21 means the ECT sensor is out of range. Was the car fully warmed up when you ran the test? If not that's why it threw the code. If the car was cold ignore it.

33 relates to the EGR not opening. Since you don;t have it ignore it.

If I were you I would start looking a cylinder #8 for a problem.
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Shuddering engine...UPDATE July,1

Reply #113 –
Quote from: vinnietbird;392909
Yeah, I got that. I got an "8" on the test. SOMETHING going on at the number 8 cylinder. I'll check the injector (looking for a replacement now) check the plug again, and hopefully it's not a valve. I doubt a valve is the problem.

Ready for any ideas at all............

Try switching the #7 and #8 plug wires (keep the same firing order just switch the wires between the two not the firing order)  and see if the problem moves to #7. If so you have a bad plug wire ;).
88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, bunch of other stuff.

Shuddering engine...UPDATE July,1

Reply #114 –
I just put brand new wires on yesterday with no change to the problem. I'll pull the injector Sometime this weekend. Gotta work 12's the next two days. .
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Shuddering engine...UPDATE July,1

Reply #115 –
Just pulled the number 8 plug. Nothing eventful there to see.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Shuddering engine...UPDATE July,1

Reply #116 –
Theoretically, could a malfunctioning, not fully operational, mildly bad injector cause the car to pop from the exhaust?
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..

Shuddering engine...UPDATE July,1

Reply #117 –
Compression test in #8 while that plug is out,
[SIGPIC][/SIGPIC]

Shuddering engine...UPDATE July,1

Reply #118 –
I would think that the popping would be more valve train in nature than an injector...not what you wanted to hear i'm sure :(
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

Shuddering engine...UPDATE July,1

Reply #119 –
Bad valve maybe? Hope not.
'88 Sport--T-5,MGW shifter,Trick Flow R intake,Ed Curtis cam,Trick Flow heads,Scorpion rockers,75mm Accufab t-body,3G,mini starter,Taurus fan,BBK long tube headers,O/R H-Pipe, Flowamaster Super 44's, deep and deeper Cobra R wheels, Mass Air and 24's,8.8 with 3.73's,140 mph speedo,Mach 1 chin spoiler,SN-95 springs,CHE control arms,aluminum drive shaft and a lot more..