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Old July 13th, 2009, 10:01 AM   #1
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Default I got a no start Ford, need input!

This is my mother-in-laws car and shes as broke as broke can be so I'm trying to get this thing running right for her. (sorry about the long post, just trying to inclued all the details i can)

'97 Ford Aspire. Car has 102,000 miles on it and is an automatic. Last week It started out as a won't accelerate without sputtering and bogging problem. Once it hit 15mph it would take right off and go. The check engine light was on, and sometimes flashed. I took it to Autozone for a code read and got PO470 exhaust pressure sensor malfunction.

The first thing I thought was EGR. So, I pulled and cleaned the EGR valve. It was pretty much plugged. There were even chunks in the rubber hose! After doing this, the exhaust smell went from a rich burn smell to the normal "converter" smell. But, the same problem persists. I don't know if the exhaust pressure sensor is the cause or the result of the sputtering/bogging.

It had a complete tune-up less than 10k miles ago. Plugs, wires, cap, fuel filter were done then, and I just changed the oil and air filter the other day.

had thought it was the coolant temp sensor. I had a Ford Tempo a couple years ago that had the same type of symtoms and ended up being the temp sensor. But, the fan on the Aspire still turns on, so that shows the temp sensor is good.

Now this week: This stupid car just stalled out and WILL NOT restart. From what I was told (it's the in-laws car), it started to sputter and bog as it was backing out of the driveway. It then stalled, and just cranks without starting.

I went over to check it out and after cranking it for 15-20 sec., I smell fuel like it's starting to flood. I also pulled the fuel hose off, it dumps fuel like it should (pump replaced maybe 20k miles ago). So, it has fuel, it has spark, no broken vacuum lines, checked the MAF and it looked pretty clean. I checked the timming belt and although it is a bit loose, doesn't look like it jumped. Checked compression, #1 @ 78psi, #2 @ 100psi, #3 & #4 @ 150psi. Not great, but still enough that it should run. I took off the dist cap and it was pretty nasty (just replaced not that long ago), cleaned it out, tried starting and got a couple sputters out of it and then back to no-start cranking.

OK, heres the next round this morning. I found that the fuel pressure regulator had a bad diaphram, pulling fuel in through the vacuum line. I swapped it out with a good one from the salvage yard and STILL the same problem continues. I changed out the spark plugs thinking maybe they were fuel fouled, still won't start.
While cranking, it will act like it wants to start (I hear a few fires now and again) but it'll just crank and then I get the smell of fuel (flooding).

I also pulled the timming cover back off to check alignment. Both marks are up, #1 piston is at top, rotor pointing to #1 plug wire, timming belt didn't jump.

WTF am I missing????????????????????????????
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Old July 13th, 2009, 10:09 AM   #2
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when it stall did you check spark? Possible it stop spark that why you try crank.


This seem to similar to my 79 F150 when I use cheap gas from Fort/ Vreesland name marathon everytime I fill gas tank next day on highway I swap fuel filter.


Is fuel filter not clog?
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Old July 13th, 2009, 11:07 AM   #3
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looks like the motor went south after seeing the compression readings.

could be a bad head gasket, burnt valve, or bad rings.
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Old July 13th, 2009, 12:02 PM   #4
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put a timing light on all 4 wires just to confirm they are infact firing, then check timing
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Old July 13th, 2009, 12:40 PM   #5
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did you check valve clearance? Is this SOCH or DOHC?


that #3 have 4 correct? Can you put leak down tester on that cylinder to find where it leak to.
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Old July 13th, 2009, 06:59 PM   #6
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Quote:
Originally Posted by MilwaukeeF350 View Post
when it stall did you check spark? Possible it stop spark that why you try crank.


This seem to similar to my 79 F150 when I use cheap gas from Fort/ Vreesland name marathon everytime I fill gas tank next day on highway I swap fuel filter.


Is fuel filter not clog?
Timming marks all line up, and it has spark on all 4 cyls.
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Old July 13th, 2009, 07:00 PM   #7
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looks like the motor went south after seeing the compression readings.

could be a bad head gasket, burnt valve, or bad rings.

But it was running, then just quit. Followed by a cranking no-start.
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Old July 13th, 2009, 07:07 PM   #8
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Quote:
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did you check valve clearance? Is this SOCH or DOHC?


that #3 have 4 correct? Can you put leak down tester on that cylinder to find where it leak to.
The bad cyl reading I'm guessing is a bad/worm can lobe. It has been ticking loudly on the upper end for the last 3 years (30k miles). It just quit running abruptly, not a gradual thing. It was running, then just quit. I can hear the fuel pump running as I crank it.

It has fuel, it has spark, it has good enough compression. It should (mechanicly) fire. I'm leaning towards somthin along the lines of engine management maybe???
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Old July 13th, 2009, 11:14 PM   #9
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Timming marks all line up, and it has spark on all 4 cyls.
I mean after engine run then died then did it have spark or no?
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Old July 14th, 2009, 10:33 AM   #10
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I mean after engine run then died then did it have spark or no?
When I was messing with it yesterday, it did have spark.
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Old July 14th, 2009, 11:40 AM   #11
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You say this car has a MAF? (mass air flow sensor) Try unplugging it and see how / if it starts / runs. It should run unplugged, if somewhat shitty.

It sounds to me like you are injecting too much fuel which points to air being measured wrong.
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Old July 14th, 2009, 06:11 PM   #12
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You say this car has a MAF? (mass air flow sensor) Try unplugging it and see how / if it starts / runs. It should run unplugged, if somewhat shitty.

It sounds to me like you are injecting too much fuel which points to air being measured wrong.

Tried that too, still wouldn't start.

Today I tried starting it with the O2 sensor pulled out, checking for a possible plugged converter. Still no start. It's got very strong pressure out the tail pipe while cranking, so I really don't thin k the converter is plugged.
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Old July 15th, 2009, 03:34 PM   #13
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PO470 exhaust pressure sensor malfunction

that leads me to think the exhuast is pluged. try un hooking it right at the manifold and start it up. a buddy of mine had a 96 dakota do the same thing it was running sluggish and crappy went threw the whole check list then we cut off his cat/muffler and it ran like a brand new truck.
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