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Topic: Shuddering engine...UPDATE July,1 (Read 14850 times) previous topic - next topic

Shuddering engine...UPDATE July,1

Reply #60 –
Just so I'm clear is this just a vibration problem or you see decreased performance/ gas mileage too? maybe you can take a video of the car running and show us what it's doing.

Why you have to pull headers? Equal length shorties?

Gotta look in the EEC book on how to initiate the test, I think after the engine running test you have to do some silly shenanigans like turn the wheel 180*, tap the brake and bump the throttle.. If you google search you will find it
[SIGPIC][/SIGPIC]

Shuddering engine...UPDATE July,1

Reply #61 –
It's probably easier to swap the wires, than to pull the plugs, vinnie.  Start easy, work up to the hard stuff like plug pulling, especially with P heads.  Save yourself some frustration.

Shuddering engine...UPDATE July,1

Reply #62 –
Quote from: vinnietbird;392670
Oh, and the test plug under the hood....there's only the bigger plug, not the smaller one. Strange, my last two Birds (both '88's as well) had the smaller plug also. This car...MIA. I can't find any broken wires, no sign it was ever there.

I found a EEC IV test running site that says that some international models have the STI wire (the single wire) in the large connector.
Do you have 4 wires in the connector instead of the usual 3?

Do you know where the harness came from?

International version

Shuddering engine...UPDATE July,1

Reply #63 –
Quote from: softtouch;392691
I found a EEC IV test running site that says that some international models have the STI wire (the single wire) in the large connector.
Do you have 4 wires in the connector instead of the usual 3?

Do you know where the harness came from?


dang, i totally forgot about that but my 84coug had no single wire either,,, interesting, what site was this your talking about?

Shuddering engine...UPDATE July,1

Reply #64 –
Quote from: jcassity;392693
dang, i totally forgot about that but my 84coug had no single wire either,,, interesting, what site was this your talking about?

http://www.thorssell.net/hbook/eectest.html

Shuddering engine...UPDATE July,1

Reply #65 –
could it be tps, Vinnie? not sure if that coyld cause the issue...
'98 Explorer 5.0
'20 Malibu (I know, Chevy, but, 35MPG. Let's go brandon, eh)

Shuddering engine...UPDATE July,1

Reply #66 –
Vinnie calm down!!! You are acting just like when you had that short in your tail lights. It sounds like an ignition flame out. If you increase the RPM easily does it shutter??? If not rev the engine briskly from idle to 2500. If it shutters then it is most likely IGNITION. First check spark at the plugs and see if it is BLUE/ Not yellow. Then a balance test in my view would be a very good idea. That will tell you a lot. Also a compression test is mandatory. But it sounds like IGNITION. On a sudden gas pedal snap if it shutters it is most likely a lack of spark. Plugs wires ETC. I am sure you can fix it. Just sit back calmly and figure it out. I have faith in you BROTHER!! Your car is to dam nice to sell. If you sell it we wont have any sympathy for you when you post you made a mistake selling it. Be cool and figure it out. keep the faith VINNIE you can do it !!
I spend money I don't have, To build  cars I don't need, To impress people I don't know

HAVE YOU DRIVEN A FORD LATELY!!
 

Shuddering engine...UPDATE July,1

Reply #67 –
Just throw this out as a "maybe" --  but have you checked the engine mounts.  Thought here is as the engine torques, it may be moving slightly and causing a "shutter".

Shuddering engine...UPDATE July,1

Reply #68 –
Motor mounts are good.

The vibration can be felt when I slowly push the gas pedal. I can easily rev it up high as well.

Maybe there's some kind of air or tiny bitty water leak in the lower intake. Just a thought.

I'm going to pull the plugs in a few minutes. Updates after that.

After this, I'm putting the Sport on probation. Any more , some kind of punishment will be invoked.
'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 #69 –
Tom, after I check the plugs and wires, I'll do the rev test and report in for you., Thanks a lot.
'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 #70 –
Vinnie,

Have you checked the MAF sensor and cleaned it?

Darren

83 351W TKO'd T-Bird on the bottle


93 331 Mustang Coupe - 368 rwhp

Shuddering engine...UPDATE July,1

Reply #71 –
Is this just an anyonance or is there decreased performance and gas milage?
[SIGPIC][/SIGPIC]

Shuddering engine...UPDATE July,1

Reply #72 –
MAYBE just MAAAAAAAAAAAYYYYBE one of your rockers is just a tad out of adjustment, causing the valve to hang open/closed for a split second longer than its sopposed to?

Shuddering engine...UPDATE July,1

Reply #73 –
I checked the rockers yesterday. The plugs all look good. The wires look good.

My code checker sucks, so I'm going to try it with a volt meter. Never have tried this before, but I'll give it a shot.

Yes, some decreases performance, and the idle sucks worse today. I put the IAC and TPS back on that were originally on yesterday morning, no change.
'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 #74 –
New problem. I don't know how to check the codes. My car isn't equipped with the small plug with the single wire. Only the larger plug.
'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..