WEEKEND PUZZLER

[Guest]

A 1988 Chevrolet Beretta GT-V 6 is hard to start and stalls out. ÂÂÂ When i do get it started the idle fluctuates. ÂÂÂ When i get to a stop light/sign i have to tap accelerator or put it in neutral to keep it from stalling. ÂÂÂ I have already had one diagnostic and had crankshaft sensor replaced and six new sparkplugs put in.  Still the same and worse since it got down to 40's F. ÂÂÂ I got another diagnostic done today and am awaiting part/s. ÂÂÂ Any ideas. ÂÂÂ I will let you know results when i get part/s replaced.   ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ ÂÂÂ tilleyev

[1988GTU]

TPS or Fuel related would be my guess.

[Guest]

Yeah- I would have to agree with 88GTU...

Has it given you a Service Engine Light?  If so, reading the code will help pin-point what's going on.  It sounds alot like a bad Throttle Position Sensor, but it could be a slew of other things--
how old are your coil packs?  
Have you replaced your fuel filter?
If not, you probably have clogging injector(s)
Have you ever cleaned the throttle body?
Something as simple as a dirty air filter could cause some of this, too...

3 things for combustion to occur, all must be in the proper quantities... AIR, SPARK, FUEL.

[Guest]

The fuel injectors were just cleaned, 6 new sparkplugs, new oil/filter, new crankshaft sensor.  Coil packs and module have 29,000 miles on.  When i am a stop light/sign i pop it into neutral so i does not stall out.  No codes came up.  Now it is very hard to start and when it does it is very rough; but smoothes out once it is warmed up.

[1988GTU]

Fuel regulator??

[Guest]

new fuel regulator

[Guest]

All good suggestions-----
plus ,don't forget to check vacuum lines .
   -and even if you seem to rule out the tps-check the wireing to  the tps-as a burnt wire insulataion in the wireing harness somewhere is not unheard of,and it happened to me a few years ago ,and each time the 2 bared wires touched the idle would go haywire and often shut the car down,once even causing the acclerator to floorboard on its own for a few miles .(thank heaven i was on the 4 lane.)

[1988GTU]

(1988GTU @ Nov. 19 2005,13:16)Q
U
O
T
ETPS or Fuel related would be my guess.
Check the return/feed fuel lines for leakage.
Could be sucking too much air, or not building vacuum.

[Guest]

My red Beretta GT is running alot better.  I was awaiting an MAF sensor- they got one in and it was a 4 pronger- mine is a five pronger.  So I guess it is taking the slow boat from China.  In the mean time I went to Harry's U-Pull-It and picked one up for under $15.00 and it ran slightly better.  Today, I checked the codes with my cheapy $27.00 Trouble Code Scanner and came up with a 22 ; which is the TPS.  You guys were right all along.  Car runs better, but there is still a vacuum leak under the plenum on the driver side.  That is for my next visit.  Other plans in the near future is a 140 amp alternator.  And for anybody into cryogenics; I had 6 Vitec Spark Plug Wires and 6 Champion Copper Plus Spark Plugs dipped in nitrogen.  I might get the plugs gapped 0.010 wider and use copper indexing washers.  I wonder whether I should get the alternator dipped in nitrogen or will that activate the flux capacitator and send my Beretta back in time.  If i went back to 1979; gas was around $1.20 a gallon.  Better use some old dollar bills and remove the current 2005 newspapers so no one will take notice.  I could tell them my Beretta is a prototype.                             tilleyev

[Guest]

and they just might believe you too

[Chazzman]

W T F, You dipped spark plug wires in nitrogen.
That's awesome.............

[1988GTU]

Click the banana ^

[gtuturbo]

(tilleyev @ Nov. 29 2005,20:11)Q
U
O
T
EToday, I checked the codes with my cheapy $27.00 Trouble Code Scanner and came up with a 22 ; which is the TPS.  You guys were right all along.
I thought you said you already had a diagnostic done and it showed nothing out of the ordinary. Sounds like whoever did it needs to get their equipment looked at...