trouble shoot this one.
#1
Guest
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trouble shoot this one.
i know this is a boat site, but this suburban is killing me. here's the deal. starts ok, revs ok in park, put it in drive and it falls on it's face coughs and sputters, if you barely give it gas it still misses but not as bad as when you nail it. here's what i've done so far. new plug wires, plugs, dist. cap ,rotor, fuel filter. any help out there?
it's a 88 suburban 454 tbi.
this problem just started and only is getting worse.
thanks
sly
it's a 88 suburban 454 tbi.
this problem just started and only is getting worse.
thanks
sly
#2
Guest
Posts: n/a
I had a 93' that had a similer problem. I did all the same things you have done, and a little more. I finaly took it to the chevy dealer here in town and had them do a check on the systems. They replaced the injecters and most of the problem went away.
Cramer
Cramer
#5
This may sound crazy but when was the last time you put injector cleaner in it? Try double ar triple doseing it. It sounds to me like you have very dirty injectors. Pull the air cleaner off it and start it up then while you watch the stream of fuel coming off the bottom of the injector play with the throttle. Is the stream a fine spray or is it a lot of droplets? If it is droplets then do the heavy dose of injector cleaner...
#7
It will only take 10 minutes to just go out and look at the spray pattern coming off the injectors. I'm preatty sure it is just dirty injectors. A friends truck of the same year had the same symptoms and the cleaner fixed it ( like new he said )
#9
RPM a clogged fuel filter or bad fuel pump wont cause sputtering it will cause loss of top end power and the loss will slowly work its way down the rpm as the problem gets worse. With real dirty injectors the engine will idle fine in neutral and not in gear because in gear it is under a higher load and fuel atomization is more critical.