? about my 87 GLHS issues..........

[chargr71]

My 87 GLHS when i start it up it rev's at about 3,000 rpm's........ what could be some causes for this? its all stock...

[cordes]

A vacuum leak would do that for sure. I would check for those first. I would also pull the codes and post up your findings.

[86seeS]

tps on the throttle body

[minigts]

My 87 GLHS when i start it up it rev's at about 3,000 rpm's........ what could be some causes for this? its all stock...

Does it ever come down or just stay there? What intake are you running? The two piece has a place under the elbow where a bolt should go. If not, the intake is pulling air in from that spot. That's one possibility, but there could be many.

[prepared]

Does it ever come down or just stay there? What intake are you running? The two piece has a place under the elbow where a bolt should go. If not, the intake is pulling air in from that spot. That's one possibility, but there could be many.

^^This. IIRC, that bolt hole is for the support that many 2-piece intakes no longer have.

[supercrackerbox]

Exactly what I was going to say as well.

[chargr71]

Thanks guys i replaced the tps cant find a vacuum leak, it is the 2 piece manifold. It was running just fine then one day started to rev at a light and seems to go down when driving so just at idle.

[cordes]

Thanks guys i replaced the tps cant find a vacuum leak, it is the 2 piece manifold. It was running just fine then one day started to rev at a light and seems to go down when driving so just at idle.

I would check the speed distance sensor too if you still have problems. I have had many LMs not throw a code for one when bad. If you put a digital multimeter on it with one lead on each part of the connector and test for continuity you should hear about 8 beeps per revolution. If it's not getting continuity or it's intermittent the sensor is bad.

[86seeS]

thats what mine was doing it was tps

[dodge78]

My shadow did that when I bought it. Turned out an AIS wire rubbed thru on a bolt head. Taped it up and is well.

[Stratman]

+1 on the speed distance sensor. Some cars have a short extension wire from the wire harness to the SDS. Mine gave me issues similar to this and the loose connection would cause erratic MPH reading hitting up to 100+ MPH while at idle when I was watching the scanner. This would cause AIS to increase.