1985 Chrysler Le Baron NO START_ please help_all techs stum

CLINTON_L

MEMBER
1985 CHRYSLER LE BARON
4 CYL
FWD
AUTOMATIC
85,000 MILES

This is a weird one. All techs at Chrysler dealership stumped! No start, has fuel, spark, verified valve timing,
replaced pickup plate, injectors, power module, logic module. Good fuel pressure, good injector pulse and plenty of fuel. This is the weird part, will run with throttle body cleaner sprayed down the throttle body?
Used propane in pcv circuit and runs, remove injector rail with new injectors, plugged holes with old injectors and started with propane and injectors are injecting fuel!
has plenty of vacuum, good compression. Disconnected
map sensor and no change. While cranking it try's to start but won't. Checked egr, looks ok, used old drb ll with super cart and no codes. We are all going nuts with this gem. Any thoughts or ideas would greatly be appreciated. ASE Master, Chrysler, Jeep, Dodge. 1989

4 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there,

Thank you for the donation,

This is a bit strange, ok to start with, after a start attempt on petrol are the plugs wet, clean the plugs and try, is it over fueling? Let me know what you find,

mark (mhpautos)

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Friday, July 30th, 2010 AT 1:47 AM

CARADIODOC

MECHANIC
33,873 POSTS

Hi guys. Excuse me for interrupting, but we ran into the same thing on a couple of cars. Take some fuel from the car and make a puddle on the ground. Throw a lit match on it. If it puts the flame out, it's water, not gas.

Caradiodoc

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Friday, July 30th, 2010 AT 3:45 AM

CLINTON_L

MEMBER
2 POSTS

First off, thanks for the replies.

This car came in with bad fuel and the fuel system
was flushed throughly. Spark Plugs have been cleaned and have good spark. Keep in mind this vehicle will run if you introduce throttle body cleaner down the throttle body. This by the way is a turbo model. We hooked up an external fuel source ( moc fuel injection cleaner pressurized can at fuel rail) and still not firing?

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Friday, July 30th, 2010 AT 10:58 AM

MHPAUTOS

MECHANIC
31,937 POSTS

Have the injectors been bench tested for correct spray patten & delivery rate. We Know that the ignition is correct so we have a fuel delivery or air delivery system problem, Fuel pressure ok, injectors are firing? Check that the plugs are getting wet as fuel is not igniting, if so it must be.

1, Fuel delivery extremely over rich
2, Air delivery restricted causing very over rich conditions,
3, compressions low,
4. Valve timing incorrect,

Don't get stuck on one track, re check over again, remember starter fluid has an incredibly high flash point, so combustion will take place under conditions that petrol will not, that is the purpose of the stuff, so maybe, re check ignition as well, hook up to an oscilloscope and check ignition firing Kva, that may be well down.

Mark (mhpautos)

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Friday, July 30th, 2010 AT 5:50 PM