Need some help with 5.0

McDoogle5.0 · Aug 15, 2009

2nd gear is slipping, could this be caused by a completly severed o2 sensor on the passanger side, plus ive only got two sensors on the whole of the exhaust. Is that normal? I will upload a video as soon as the web page is done converting it, showing you the startup and how funky this thing sounds. It is an old beaut.. but it recently feels like on the snap of a finger, i lost 100 hp... something is wrong...

1988 5.0 H.O 5-speed manual
heads
exhaust
intake

Mustang5L5 · Aug 15, 2009

Well if 2nd gear is slipping, then it's because your clutch is slipping. Has nothing to do with the 02 sensors.

But a severed 02 is another prob in itself. You might want to fix that as well. There are only 2 02 sensors on 5.0's....on on each side

McDoogle5.0 · Aug 15, 2009

Ive got it on the lift now, but its too hot outside to do any work.
Here is a video of the startup...

Untitled on Vimeo

please take a look and listen/see/know what it is that is wrong.. this just started when 2nd gear was slippin

McDoogle5.0 · Aug 15, 2009

nobody watch the video and have an idea whats goin on?

McDoogle5.0 · Aug 15, 2009

ive changed the o2 sensor ( one of them ) .. the fuel filter.. and the oil just now .. its still not running right.

87GT40 · Aug 15, 2009

if you think its o2 then run codes. sounds like a vac leak.

McDoogle5.0 · Aug 15, 2009

vac leak? srry im not very technical, thanks for the response.

McDoogle5.0 · Aug 15, 2009

vac leak? srry im not very technical, thanks for the response.
will murrays (autostore ) be able to hook up to the computer?

87GT40 · Aug 15, 2009

they should. vac is short for vacuum.

McDoogle5.0 · Aug 15, 2009

this is fuel injected.. does it still have vac cables?
If so where are they located on the 302?

Chrome_Rust · Aug 15, 2009

surging idle checklist start here... also check out the stickies at the top of the page on the forum list...

87GT40 · Aug 16, 2009

yes you can still have vac leaks. it doesnt have to be from a line though. could be a bad gasket around the intake or something. all the vac line are on the back of the intake.

Mustang5L5 · Aug 16, 2009

This is an '88 right?? IS it still speed density or was it converted to mass air??

HAve you tried running codes?

You have a bad idle surge. It could very well be a vacuum leak. Grab a cab of carb cleaner and spray around the engine bay. If the idle rises up, you've found a leak.

What mods are on this engine?

90mustangGT · Aug 16, 2009

Check engine light on? I agree it sounds like a vacuum leak although a non-MAF car it will just idle high.

What did you do to the car just before this? It could be a number of things.

McDoogle5.0 · Aug 16, 2009

0-60 on a 8% uphill

ford gave my father the car as a gift in 1988 no strings attatched... hes a 35 year man ( tool maker ) but isnt very mechanical.. so this is left to me.. and hes not very eager to keep it running. This car was fresh out of the factory feeling up to a week ago.

I got into a fight with a really big punk.. could it be water in the gas tank.. ive left it outside a few nights in the last week, and thats when it started, also i left it outside in a rainstorm/heavy downpour all morning with the windows down.. ( big mistake / wet ass when i finally woke up and ran outside )

Aftermarket Clutch
Aftermarket Exhaust
Some transmission repairs ( by an idiot who also " fixed " the heater core.. or did he.. it still doesent work... 2nd gear is very tricky!!! but this was a long time ago... )

OH! and the biggest mistake... still havent fixed but i do have all the parts from the break lines to the master cylinder .. power steering fluid in the break lines haha ( old mans mistake )

McDoogle5.0 · Aug 16, 2009

after going thru a book of service reports, adding up to thousands of dollars ( even back then holy crap were mechanics expensive )
04 we put new 40 Series Delta Flow FlowMasters.
92 replaced heater core hose
93 perform 91e13 cat recall ????
96 replaced ignition switch

always serviced when anything when slightly wrong until recently..
many other miniscule changes and many services throught 96

I BELIVE IT TO BE AN 88 CALI VER. ORIGINAL MASS AIR NO CONVERSION.

McDoogle5.0 · Aug 16, 2009

Here is a picture of the unit.

CLICK THAT ^^ for full size.

Mustang5L5 · Aug 16, 2009

But in your original post it says

1988 5.0 H.O 5-speed manual
heads
exhaust
intake

I only see a stock intake in that pic. What heads are on there? Stock?

You still should run the codes first

McDoogle5.0 · Aug 16, 2009

Mustang5L5 said:
But in your original post it says

I only see a stock intake in that pic. What heads are on there? Stock?

You still should run the codes first

Mistaken. Is running codes difficult?
went up to oreileys and got an air filter by fram today.

Mustang5L5 · Aug 16, 2009

Chrome_Rust already gave the link in post #11.

http://www.stangnet.com/mustang-forums/698148-help-me-create-surging-idle-checklist.html

Read that carefully. Your prob is not anything new so that thread should help guide you

Need some help with 5.0

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