1992 escort gt studders all the time at wide open throttle

[xsbc63x]

my buddy has a 92 i believe escort gt it studders when you stomp the throttle but if you gradually rev it up it goes fine. any possibilitiesor fixes. i was thinking vane air flow sensor

[xsbc63x]

anyone have any fixes??

[jeffescortlx]

Check the rubber intake tube for cracks.

[A. Souphound]

Originally Posted by xsbc63x

my buddy has a 92 i believe escort gt it studders when you stomp the throttle but if you gradually rev it up it goes fine. any possibilitiesor fixes. i was thinking vane air flow sensor

It sounds like a fuel delivery problem: Fuel Filter, low Fuel Pump pressure etc. Trouble codes present?
Do you know what type of Fuel System it has i.e. carburetor, CFI (Central Fuel Injection) or EFI (Multi-port electronic fuel injection)?

[Jet-Lee]

plugs and/or wires.

I had the same thing and got the same responses. check your plugs and replace your wires with cheap OEM. the OEM's probably wont last long, but will tell you if that was the problem. If not the problem, switch the wires back out and get a refund if you please, or keep the new ones as backup.

[xsbc63x]

plugs and wires have been changed, the intake elbow is good no cracks, the vaf has been changed a little better, the cts was also changed it idles better, i told him to do the fuel filter it looks like it has been done recently but looks can be decieving. ill let you guys know.thanks for the help. it is mfi injection

[chevyn0va1]

Originally Posted by xsbc63x

plugs and wires have been changed, the intake elbow is good no cracks, the vaf has been changed a little better, the cts was also changed it idles better, i told him to do the fuel filter it looks like it has been done recently but looks can be decieving. ill let you guys know.thanks for the help. it is mfi injection

How about a gummed up throttle body(carb which ever you have) ? That could cause your troubles

[xsbc63x]

tb looks clean

[chevyn0va1]

Originally Posted by xsbc63x

tb looks clean

looks clean? do you know what one looks like not clean by any chance?

[xsbc63x]

yes i happen to know what one looks not clean. fuel filter did nothing.

[A. Souphound]

Originally Posted by xsbc63x

plugs and wires have been changed, the intake elbow is good no cracks, the vaf has been changed a little better, the cts was also changed it idles better, i told him to do the fuel filter it looks like it has been done recently but looks can be decieving. ill let you guys know.thanks for the help. it is mfi injection

Suggest you test the MAP voltage output: Idle should be approx. 1 - 2VDC, WOT (Wide open throttle) should be 4 to 4.8 VDC. The EEC uses the MAP input to control fuel delivery, and ignition timing.

[xsbc63x]

thanks souphound will have him check that out i asked him if it had a map sensor on it but he didnt know ill check tomorrow so map voltage should be pretty close to tps?

[A. Souphound]

Originally Posted by xsbc63x

thanks souphound will have him check that out i asked him if it had a map sensor on it but he didnt know ill check tomorrow so map voltage should be pretty close to tps?

In terms of voltage........yes.
Also check the vacuum line from the MAP to the intake manifold for leaks.

[xsbc63x]

no leaks from intake manifold when i measured voltage at ilde it was jumping all over the place form .7 to .3 and wot it went up to 4.3 then jumping all over the place up there too

[A. Souphound]

Originally Posted by xsbc63x

no leaks from intake manifold when i measured voltage at ilde it was jumping all over the place form .7 to .3 and wot it went up to 4.3 then jumping all over the place up there too

Question:The MAF is solid state, are you using a DVOM for testing? (A DVOM should be used on any solid state circuit to prevent damage.)

Comment: We have to determine the cause of the voltage "jumping" There are four components tied together i.e. EEC, TPS, VAF and MAP. The EEC supplies 5V reference voltage and also ground.The signal voltage from the three sensors overlay each other and provide input back to the EEC.(To adjust fuel and timing). Your previous posts indicate you changed the VAF, so we will go to the TPS.
Question: Have you tested the TPS for both resistance and voltage?
Comment: I use an analog meter to check TPS resistance, and a DVOM to check TPS reference voltage (5V) from the EEC. Most TPS's are 3 wire: Black wire is (-) Center wire is signal, other outside wire is (+). Disconnect the sensor and read ohms between the two outside wires at idle the resistance should be approx. 'O' now increase the throttle very slowly toward WOT and watch the needle. It should increase smoothly. no jumps. If there are any jumps, the TPS is bad and needs replacing.
Let me know the outcome.