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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

Engine Need Advice

  • Thread starter Thread starter Prodigy
  • Start date Start date Jul 27, 2015

Prodigy

Member
Jul 7, 2015
92
21
18
Jul 27, 2015
#1
  • Jul 27, 2015
  • #1
So here goes I recently acquired a 95 5.0 t5 black car. The guy that had it didn't know much about it, his wife was making him all, but there were a bunch of receipts. It has a f303 cam, sbf cam spring kit, true roller timing set, gt40 heads, upper, and lower intake, k&n filter, some brand of shorty headers and flows. Auto lite plugs and wires, Motorcraft distributer. The car starts and idles great around 750, but over warm when you shut it off. If you start again it just keeps dieing, it won't idle on its own. You can Rev it up drive, then it is fine. Any ideas would be greatly appreciated, I have contacted bama tunes to see if a tune can remedy this. Thanks for any input.
 

toyman

10 Year Member
Jul 19, 2007
1,944
54
79
Vernon BC
Jul 28, 2015
#2
  • Jul 28, 2015
  • #2
Clean the MAF sensor element. Once the engine reaches operating temps the ecu runs in closed loop and this requires that all the sensors function correctly. To this end ensure the battery to engine and engine to chassis grounds are solid. You need to remove the terminals and clean them to bare metal. Also, check for corrosion in these cables under the sheathing at each connection point. You do not need a Bama tune or for that matter any tune based on your mods.
 

Prodigy

Member
Jul 7, 2015
92
21
18
Jul 28, 2015
#3
  • Jul 28, 2015
  • #3
10 4, I was going to clean the maf and air filter sometime this week. I'll double check the terminals aswell, thanks for the info
 

Prodigy

Member
Jul 7, 2015
92
21
18
Jul 28, 2015
#4
  • Jul 28, 2015
  • #4
Got the maf cleaned aswell as air filter before the great kicked in. Once air filet dries, then oil it, wait done more and see what happens.
 

Prodigy

Member
Jul 7, 2015
92
21
18
Aug 9, 2015
#5
  • Aug 9, 2015
  • #5
Cleaned maf still having trouble keeping car running when it's hot, and you let it sit a little bit and come back and start it. Dies at idle.
 

toyman

10 Year Member
Jul 19, 2007
1,944
54
79
Vernon BC
Aug 9, 2015
#6
  • Aug 9, 2015
  • #6
Idle rpm is a PCM commanded value. The IAC valve may have failed. It's an on/off solenoid that controls the air flow to the TB at idle. I would suggest that for under $25 you buy a code reader such as this one. The reader will help pinpoint the problem rather than relying on guesses.
 

Prodigy

Member
Jul 7, 2015
92
21
18
Aug 9, 2015
#7
  • Aug 9, 2015
  • #7
So it can throw a code without a check engine light, either way I'll pick up that reader. Thanks for the info
 

revhead347

Apparently my ex-husband made that mistake.
20+ Year Stangneter
Jun 14, 2004
9,288
1,631
214
Acworth, GA
Aug 9, 2015
#8
  • Aug 9, 2015
  • #8
Yes, it can have stored codes without a check engine light.

Kurt
 

Prodigy

Member
Jul 7, 2015
92
21
18
Aug 10, 2015
#9
  • Aug 10, 2015
  • #9
10 4 thanks, wasn't aware of that
 

poboys 94

Member
Dec 5, 2006
115
2
18
St. Louis Mo.
Aug 24, 2015
#10
  • Aug 24, 2015
  • #10
toyman said:
Idle rpm is a PCM commanded value. The IAC valve may have failed. It's an on/off solenoid that controls the air flow to the TB at idle. I would suggest that for under $25 you buy a code reader such as this one. The reader will help pinpoint the problem rather than relying on guesses.
Click to expand...

This..^^^ Yep check the IAC, I used to clean mine if I remember correctly..
 
T

Tyler Neuman

New Member
Aug 27, 2015
12
0
1
Aug 31, 2015
#11
  • Aug 31, 2015
  • #11
This happened to me before. It was just corroded battery terminals. Cleaned those up and idled fine.
 

toyman

10 Year Member
Jul 19, 2007
1,944
54
79
Vernon BC
Sep 1, 2015
#12
  • Sep 1, 2015
  • #12
Tyler Neuman said:
This happened to me before. It was just corroded battery terminals. Cleaned those up and idled fine.
Click to expand...

Solid battery to engine and engine to chassis grounds are one of the most overlooked but critical maintenance points. Without good grounds all sensor outputs are negatively affected. That with aging sensors will cause numerous operating issues.
 

Prodigy

Member
Jul 7, 2015
92
21
18
Sep 18, 2015
#13
  • Sep 18, 2015
  • #13
The ground on block is solid, I'll clean battery terminals for good measure. What do I clean the iac with?
 

Prodigy

Member
Jul 7, 2015
92
21
18
Sep 19, 2015
#14
  • Sep 19, 2015
  • #14
Cleaned terminals and grounds. Took apart throttle body abd was full of gunk, removed tps and iac and removed all gunk. Replaced the tps and iac as they were original and iac was gunned up inside, tps had cracked. Now I found I need a new throttle cable as mine is loose, zip ties until new cable arrives. Waiting to bring it out and see how it does.
 
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