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General >> Troubleshooting

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juspifool
CEG'er

Reged: 03/31/02
Posts: 326
Loc: Erie, PA
Top end Loss
#1298702 - 08/11/06 08:00 PM

Today I noticed a loss of top end in my 1998 SVT. I know its not the IMRC because I can feel that open. It starts to feel sluggish around 5500 and will barely pull over 6500. Also, the car seems to be idleing at around 1500, I already ordered a new IAC. Any ideas on the top end loss?

--------------------
1998 T-Red SVT Contour
#2588 of 6535

2005 F-150

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todras
I have no life

Reged: 05/29/00
Posts: 21197
Loc: Grand Rapids, MI
Re: Top end Loss new
#1298728 (Re: juspifool) 08/11/06 08:44 PM

New plugs & wires and an intake manifold cleaning.

--------------------
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me


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Rogerm60
Hard-core CEG'er

Reged: 10/11/02
Posts: 2408
Re: Top end Loss new
#1298736 (Re: juspifool) 08/11/06 08:51 PM

Steady high idle is sometimes an ECT going bad.

Otherwise the IAC or rich mixture combined with an air leak.



--------------------
"Those who cannot remember the past are condemned to repeat it" -George Santayana

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Tony2005
Addicted CEG'er

Reged: 06/19/05
Posts: 5345
Loc: Virginia, USA
Re: Top end Loss new
#1298862 (Re: juspifool) 08/11/06 11:57 PM

Originally posted by juspifool:
.. Any ideas on the top end loss?



Any CEL codes?

--------------------
"Always do the cheap and easy ones first."

1996 V6 ATX 96K miles


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2X95SEs
Veteran CEG'er

Reged: 10/27/00
Posts: 770
Loc: Houston, Texas
Re: Top end Loss new
#1298864 (Re: juspifool) 08/12/06 12:00 AM

Have you checked the voltages from the TPS sensor? Should be 1 to 5 volts smoothly across the scale.

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juspifool
CEG'er

Reged: 03/31/02
Posts: 326
Loc: Erie, PA
Re: Top end Loss new
#1299134 (Re: 2X95SEs) 08/12/06 01:59 PM

Plugs and wires have about 12k on them. Manifold was cleaned over the winter as well.

Its not really a steady high idle, it goes between 1200 and 1500.

TPS voltage is .98 to 4.89.


I did take of the UIM and checked out the gaskets. It looks like the ones for two of the cylinders were not sealing properly. So I am guessing that they are leaking air, and creating a lean condition. I also checked the spark plugs and they are looking pretty white, which would indicate a lean mixture. So I am going to replaced the gaskets and go from there. I will update this thread with the results.

-Mark

--------------------
1998 T-Red SVT Contour
#2588 of 6535

2005 F-150

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juspifool
CEG'er

Reged: 03/31/02
Posts: 326
Loc: Erie, PA
Re: Top end Loss new
#1300277 (Re: juspifool) 08/14/06 06:29 PM

Well after replacing the UIM gaskets, the car will idle normally most of the time. It also seems that the rod that goes to the front bank secondaries had fallen off. I am still having a problem with high idle about 20% of the time. Idles at around 1100.

**Edit**

Now that I think about it, I am not sure I have a EGR gasket, could that be causing my problem?

--------------------
1998 T-Red SVT Contour
#2588 of 6535

2005 F-150

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Tony2005
Addicted CEG'er

Reged: 06/19/05
Posts: 5345
Loc: Virginia, USA
Re: Top end Loss new
#1300301 (Re: juspifool) 08/14/06 07:16 PM

Originally posted by juspifool:
...Now that I think about it, I am not sure I have a EGR gasket, could that be causing my problem?



High idle, yes.

--------------------
"Always do the cheap and easy ones first."

1996 V6 ATX 96K miles


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todras
I have no life

Reged: 05/29/00
Posts: 21197
Loc: Grand Rapids, MI
Re: Top end Loss new
#1300305 (Re: Tony2005) 08/14/06 07:23 PM

Are ghettoing everything? I'm guessing you didn't replace the gaskets the first time you did the UIM cleaning. Doesn't take very much age for them to wear out. I'd replace them if they only had 30k on them. Did you tq down the new ones to 7 ft lbs and in the correct sequence. No or bad EGR gasket will cause a host of issues.

--------------------
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me


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juspifool
CEG'er

Reged: 03/31/02
Posts: 326
Loc: Erie, PA
Re: Top end Loss new
#1300314 (Re: todras) 08/14/06 07:38 PM

I did replace the UIM & LIM Gaskets when I cleaned it the first time. I took off the UIM early last week to see if I could figure out why the idle was acting up. I think when I put it back together I accidently messed up the UIM gasket. As to where the EGR gasket went, I thought I replaced it, but looking back, I don't think its there.

--------------------
1998 T-Red SVT Contour
#2588 of 6535

2005 F-150

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