1988 ford ranger rough idle

Asked by Nov 07, 2016 at 03:57 PM about the 1988 Ford Ranger STX Extended Cab 4WD SB

Question type: Maintenance & Repair

OK here I am again, 1988 ford ranger 2.9. I had the transmission rebuilt.
Ever since then it has been idling rough. I have changed the PVC valve,
fuel filter, plugs and wires,distributor cap and rotor, coolant temp. sensor.
No other codes except the coolant temp. sensor. It seems to be running ok
but it was not like this before the tranny rebuild. We checked for vacuum
leaks and found none. Please help this one is driving me crazy.

2 Answers

120

Does it have a hall effect sensor in the distributor?

35

Try resetting the PCM by disconnecting the battery for about 5 minutes. That will wipe all codes or faults and see if it runs better. If it does than you know it is something electrical like a sensor or wire. If it is still the same than it has to be something mechanical like a valve or something. Be sure to check really good for vacuum leaks, the 2.9 is covered in emmisions crap and there are a ton of vacuum hoses hiding.

Your Answer

Add photo

Related Questions

Search Ford Ranger Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Ford Ranger Experts

#1 FordNut
FordNut
Reputation 1,390
#2 tennisshoes
tennisshoes
Reputation 1,160
#3 Tracy Hooks
Tracy Hooks
Reputation 730
View All

Related Models For Sale

Used Ford F-150
3,217 Great Deals out of 205,088 listings starting at $1,779
Used Chevrolet S-10
10 Great Deals out of 1,632 listings starting at $1,795
Used Dodge Dakota
128 Great Deals out of 4,388 listings starting at $995
Used Jeep Wrangler
488 Great Deals out of 17,959 listings starting at $2,950
Used Ford Mustang
582 Great Deals out of 41,215 listings starting at $1,699
Used GMC Sierra 1500
1,057 Great Deals out of 58,731 listings starting at $1,599

Used Cars For Sale

2011 Ford Ranger For Sale
59 Great Deals out of 1,242 listings starting at $4,777
2010 Ford Ranger For Sale
20 Great Deals out of 508 listings starting at $3,450
2009 Ford Ranger For Sale
20 Great Deals out of 395 listings starting at $3,999
2008 Ford Ranger For Sale
21 Great Deals out of 545 listings starting at $3,499
2007 Ford Ranger For Sale
20 Great Deals out of 392 listings starting at $1,995