Tommybeach

rough running and poor start up

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My car was performing perfectly, until I pulled through some tall grass. It was just loose farm grass, that I slowly drove through. I switched off my Reatta for a few minutes. When I started it, there was no start problems, but it immediately began to run roughly, like it wanted to cut off. I gave it a little extra fuel and it kind of lunged, like it had bad gas. I drove it home ( about a mile ) expecting the problem to clear, but it did not. The next day, I drove to the gas station and put in some high octane, still thinking it was something in the gas, but it did not help. The following day I started to the garage to have it checked out. I didn't make it. It cut off, and restarted a couple times, until it refused to crank. I rented a dolly and took it to the shop, thinking the mechanic would quickly identify my problem. That was weeks ago, and several parts later.. So far I replaced the fuel pressure sensor, mass air module, and some other little sensor ! The mechanic told me to ask for your help, because he did not want to guess any more ... Does anyone have any ideas ?

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Common symptoms of a bad Ignition Control Module (ICM) or a bad Crankshaft Position Sensor. Look for green/gray goo on the side ICM as shown in the photo below. It's a sign that it's bad.

 

ICM-magnavox-goo.jpg

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thanks Ronnie,  by the way, I got hooked on the Reatta fever, when I lived in Knoxville ..... I was testing new cars... I drove a 1991 Reatta, and then drove to West Knoxville to test drive a new BMW.... After driving the BMW I rushed back to the Cadillac dearlership on Alcoa hwy--- the Reatta was pulling out when I got back to the lot... I told the salesman that I wanted to buy the Reatta when it got back from the "test drive" . The salesman smiled at me, and said, " it isn't coming back" , I just sold it !  When I moved back to South Carolina, I told my cousin about the Reatta... his son in law owns a car lot.... and he found me one about 10 years ago... I love it !

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It's rare to see a Reatta in this part of the country now. I live about 40 miles west of Knoxville. I go to cruise-ins and car shows pretty often in Knoxville.  It's been a couple of years or more since I saw one besides mine.

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52 minutes ago, D-a-n-i-e-l said:

Check for grass or damage from said grass around cps

That's my guess too. I once drove through deep water with the Red. Car died and took awhile to starg again. You didn't say what year Reatta you have but if it is an '88 to '90  Ronnie could also be right, but I would start with the Crank Sensor.

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thanks for your answers ...my Buick Reatta is a 1990---  it was running great !  Just wondering... how does grass have an effect on the crank sensor ? I am new to all this electronic system stuff...

I drove this car for years before having a problem.... I guess I should have known better than to drive through the grass, but it didn't appear to thick or, even too high . My first problem occurred 3 years ago. It was at night, and I ran over a coon. The lights went off, and then back on... I drove home, with no problems.

The following day,  I put my Reatta on a lift, and inspected it for damages. Nothing was found, but shortly afterward, the dash light cluster began to go off, followed by cranking problems. I replaced a cracked cam shaft pulley and cam shaft sensor. This was followed by replacement of oil pressure sensor, mass air flow sensor, fuel pressure filter. Replaced ABS system completely. Replaced climate control unit. Replaced cruise control module , and climate control module. 

 Next radiator, thermostat, and water temperature sensor. Replaced battery and alternator. 

I had the old changed and the person over filled the engine. He installed one quart too much, and he did not drain it out. It seems like every time I have every thing working ( except the dash cluster going off and on ) something else will break... 

Reatta passnegers side.JPG

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20 minutes ago, Tommybeach said:

Just wondering... how does grass have an effect on the crank sensor ?

 

The back of the harmonic balancer has a notched shutter ring that runs closely through a gap in the crankshaft position sensor. If grass got caught in the notched ring and pulled into the sensor it could move or damage the sensor.

 

crank_sensor.jpg

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Did you check for a clogged air intake ? That was my first though when you said "tall grass".

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4 hours ago, padgett said:

Did you check for a clogged air intake ? That was my first though when you said "tall grass".

I checked the air intake blower and duct 

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